gHS-SET – aluminium goose flap, size 33x50 + marten protection rail + connector

The VSD basic solution. Control via twilight (timed with optional accessories) and manually, powered by 4x alkaline batteries Open and close it as it gets light or dark. Opens the chicken flap automatically when it gets light. Closes the chicken flap automatically when it gets dark. The light sensor is built into the unit. No separate light sensor is required if the unit is mounted on the outside of the barn. If you are installing the Doorkeeper inside the stable, please order a sensor extension, the external light sensor (ASb), in the appropriate length. You should also open and close the chicken flap manually. The magnet is held briefly against a control panel on the device, causing it to open or close. Is the unit installed indoors…? So you can’t access the control panel for manual operation? Order the extension cable (ext.SA) straight away. Place the control panel for the magnet in a location that is easily accessible to you. Battery power supply The device is powered by 4x alkaline batteries. The batteries have a service life of approx. 2-3 years, depending on the weight of the slider and general environmental conditions. This allows for a high degree of independence from mains sockets and is ideal, for example, for mobile chicken coops. The device uses an LED to indicate when the batteries are too low.A plug-in power supply (ST) or another voltage source between 6 and 12V can also be connected in parallel or as the sole power source. In the case of, for example, external batteries, such as those used in off-grid solar systems or car batteries, the supply cable must be protected by a fuse (1A max.). Further information Extension cables are available for a number of convenient functions. External light sensor (various lengths) can be connected (available as an optional extra) – for installing the unit inside the barn Extension of the manual control (various lengths) – this allows for convenient manual operation even when the unit is installed in the barn! It is possible to add a timer function by connecting an external timer (BS-D / BS2) (optional) Optimised mechanism – ensuring a long-lasting cord Slider weights of up to 3kg are possible If you need a Doorkeeper to open a pasture gate, please take a look at the pasture gate openers BZ1, BZ3 (click on the name). These are the perfect combination for this application. The VSD is only suitable in conjunction with the external timer BS-D for equine applications. As a company, we have been manufacturing devices of this type for over 40 years. We place great importance on durable products and excellent customer service at a fair price. The Electronic Doorkeeper automatically opens and closes vertical sliding doors on chicken coops. This is controlled either via the light sensor and / or a timer. Manual control is also possible, independently of the twilight and timer controls. The light sensor is fitted as standard in every unit. Therefore, no further action is required if the unit is mounted on the outside of the henhouse. If it is to be mounted inside the henhouse, a sensor extension is required. If the flap closes and there is an animal underneath it, the device stops and only continues to close once the animal has moved away. The device has an overload protection mechanism. It reacts in a way that is gentle on the cord and repeatedly attempts to open. The slider might, for example, be frozen shut. The housings of all devices in the VS series are extremely robust. The electronics are mounted on the underside of the circuit board using SMD technology and are protected by a special coating against corrosive gases, moisture and dirt. The VSD can be installed outdoors provided it is positioned in a slightly sheltered location, and it will not open during a thunderstorm (lightning). Manual operation: With this device, it is possible to close it manually during the day. To do this, hold a magnet against a specific point on the housing. The slider will close and remain closed for the rest of the day. It will open again automatically the following morning. It is also possible for you to reopen the Doorkeeper on the same day. To do this, hold the magnet against the control panel again.  LED display: The device uses a multi-coloured LED to indicate, at intervals of several seconds, when: a) the batteries are flat or should be replaced b) the device must be in closed mode according to the limit switch position c) other general faults (for example, a twisted cord) The LED indicators are displayed for a limited time (for example, flap closed for up to approximately 1h after the closing process) to keep battery drain to a minimum. Possible accessories for the device: Extension of the built-in light sensor ASb: You can also install the device and the slider inside the henhouse using a light sensor extension cable. The Doorkeeper then receives the correct light signal from the sensor extension, which can be very easily fitted, for example, into the wooden wall of the henhouse, or attached in another location where it is slightly sheltered. Cable lengths of up to 6m are available. External manual operation, ext.SA:Do you want to open or close it manually with ease? An automatic chicken flap is often not conveniently accessible in order to trigger the function there. The manual control extension provides a solution to this problem. Position the control panel for the magnet in a place where you can easily reach it to hold the magnet against it. A great convenience. Cable lengths of up to 6m are available. Extension of the internal LED, ext.LED: The device occasionally displays status information. For example, it informs you when the batteries need replacing, when the flap is in the closed mode, or if there is a fault of any kind. You will not see this information if the Doorkeeper is installed indoors. With the LED extension, you can get round this problem by mounting the ext.LED in a more visible location. Furthermore, the external LED is also brighter than the internal one. External timer (accessory): If you wish to control the flap by time as well, or exclusively, you will need a separately available external timer for the VSD. We offer these timers in both battery-powered and mains-powered versions. If you intend to operate the Doorkeeper using a 12V mains adaptor plugged into a socket, you should use the mains-powered timer. We stock both digital and analogue clocks. The digital models are available in a battery-operated version (BS-D) and a mains-powered version (ZS-D). Our analogue clock is available in a battery-operated version. How it works: The timers set a time period during which the flap is definitely closed. This is usually, for example, from 10 pm until 8 am the following morning. Outside these hours, the light sensor determines whether it is opened or closed. This means that in this combination it closes in the evening at dusk, but no later than 10 pm. In the morning it opens from 8 am, provided it is light. If not, it opens as soon as it is light enough . Furthermore, it is possible to control the Doorkeeper solely by time, i.e. without the influence of the light sensor. It is not possible to operate a VSD and an older VSB together on a single timer. However, it is possible to operate several VSDs on one timer and several VSBs on another timer. Installation notes to avoid misunderstandings or problems:The device is supplied in the open position, i.e. with the cord wound up. A loop protrudes from the device. First, fit the rails, then insert the slider and pull it into the open position. Mount the device above this so that you can connect the loop on the device to the slider. This sets the upper stop… very simple. If the device does not fit directly over the open slider, mount it next to it, or elsewhere. You can now connect the loop on the device and the open slider using an extension cord, which you can then route over pulleys if necessary. You can find links to installation examples on this page under "Service > Installation examples"

The basic VSD solution. Control via twilight (timed with optional accessories) and manually, power supply by solar cell and NiMH rechargeable batteries. Electronic Doorkeeper VSD - solar version > a solar cell is built in + NiMH rechargeable batteries inserted instead of the standard alkaline batteries. Reliable, safe operation, regardless of weather and season – even if the sun takes a break. The device operates even more independently of the installation location. Installation in sunlight or good daylight illumination required. Alternatively: connection of external solar cell "Solar2b" possible. Open and close when it gets light or dark. Opens the chicken flap automatically when it gets light. Closes the chicken flap automatically when it gets dark. The light sensor is built into the device. No extra light sensor required if the device is mounted outside on the coop. If the Doorkeeper is mounted inside the coop, please order a sensor extension, the outdoor light sensor (ASb), in the appropriate length as well. Open and close the chicken flap manually as well. The magnet is briefly held against a control panel on the device, causing it to open or close. Is the device installed inside…? So you cannot reach the control panel for manual operation? Order the extension (ext.SA) at the same time. Place the control panel for the magnet in a location that is easy for you to reach. Power supply by solar Operation is via integrated rechargeable batteries, which are charged via an integrated solar cell. The device is intended for outdoor installation so that the solar cell is correspondingly illuminated. Alternatively, an external solar cell can be connected, which then takes over the function of the internal one (Solar2b). This enables a high degree of independence from power sockets and is ideal, for example, for mobile chicken coops. The device indicates via an LED when the rechargeable batteries are too deeply discharged. Further information Extensions are available for some convenient functions. External light sensor (various lengths) can be connected (optionally available) – for mounting the device inside the coop Extension of manual operation (various lengths) – this makes convenient manual operation possible even when the device is mounted in the coop! Adding a timer function by connecting an external timer switch (BS-D / BS2) possible (optional) optimised mechanics – resulting in a durable cord slider weight of up to 3kg possible If you need a Doorkeeper with which you want to open a pasture gate, then please take a look at the pasture gate openers BZ1, BZ3 (click on designation). These are the perfect combination for this application. The VSD is only suitable in combination with the external BS-D timer for horse applications. As a company, we have been manufacturing devices of this type for over 40 years. We place great value on durable products and strong customer service at a fair price. The Electronic Doorkeeper automatically opens and closes vertical sliders on chicken houses. This happens either via the light sensor and / or a timer switch. In addition, manual control is possible, independently of the twilight and timer control. The light sensor is basically built into every device. So nothing else is required if the device is mounted outside on the coop. If it is mounted inside the henhouse, a sensor extension is required. If the flap closes and there is an animal underneath, the device stops and only continues closing once the animal has moved away again. The device has overload protection. It reacts in a cord-protecting manner and repeatedly attempts to open. The slider could, for example, be frozen up. The housings of all devices in the VS series are extremely robust. The electronics are protected on the underside of the board in SMD technology with a special coating against aggressive gases, moisture and dirt. The VSD can be mounted outside if it is placed with slight protection, and it does not open during thunderstorms (lightning). Manual operation: With this device it is possible to close manually during the day. To do this, a magnet is held against a certain point on the housing. The slider is closed and remains closed for that day. It is opened again automatically the next morning. There is also the possibility to open the Doorkeeper again on the same day. To do this, the magnet is held against the control surface again. LED display: The device indicates to you at intervals of several seconds via multicolour LED when: a) the batteries are empty or replacement should be considered b) the device must be in closed mode according to the limit switch position c) further general faults (for example cord wound the wrong way) The LED indications are output for a limited time (for example flap closed for approximately up to 1h after the closing process) in order to keep the battery load as low as possible. Possible accessories for the device: Extension of the built-in light sensor ASb: With the help of a light sensor extension, you can also mount the device and the slider in the henhouse. The Doorkeeper then gets the correct light information from the sensor extension, which can be mounted very easily e.g. in the wooden wall of the henhouse, or attached in another place, slightly protected. Cable lengths up to 6m are available. External manual operation, ext.SA:Would you like to open or close manually conveniently? An automatic chicken flap is often not conveniently accessible in order to trigger the function there. With the extension of the manual operation you have a solution to the problem. Place the control panel for the magnet in a place that you can easily reach in order to hold the magnet there. A great relief. Cable lengths are available up to 6m. Extension of the internal LED, ext.LED: The device outputs status information from time to time. For example, it informs you when the batteries need to be replaced, when the flap is in closed mode or if there should generally be an error. You do not see this information if the Doorkeeper is installed inside. With the LED extension you get around the problem by mounting the ext.LED in a more visible place. In addition, the external LED is also brighter than the internal one. External timer switch (accessory): If you would also like to control the flap by time, or exclusively by time, you need a separately available external timer switch for the VSD. We have these timers as battery-operated and mains-powered versions. If you intend to operate the Doorkeeper by means of a 12V power supply unit at the socket, you should use the mains-powered timer switch. We have digital and analogue timers in our range. The digital ones are available as a battery-operated version (BS-D) and a mains-powered version (ZS-D). Our analogue timer is available as a battery version. How it works: The timers define a period during which it is definitely closed. This is generally, for example, from 10 pm until 8 am in the morning. Outside this time, the light sensor determines whether it is opened or closed. This results in this combination being closed in the evening by twilight, but by 10 pm at the latest. In the morning it opens from 8 am, provided it is light. If not, it opens as soon as it is light enough to do so. Furthermore, it is possible to control the Doorkeeper exclusively by time, i.e. without influence of the light sensor. It is not possible to operate a VSD and an older VSB together on one timer switch. However, it is possible to operate several VSDs on one timer switch and several VSBs on another timer switch. Notes on installation to avoid misunderstandings or problems:You receive the device in the open position, i.e. with the cord wound up. A loop protrudes from the device. First you mount the rails, then insert the slider and pull it into the open position. Above that you mount the device so that you can connect the loop of the device to the slider. This defines the upper stop… very simple. If the device does not fit directly above the open slider, mount the device next to it, or elsewhere. You can now connect the loop of the device and the open slider with an extension cord, which you then guide over pulleys if necessary. Links to installation examples can be found on this page under "Service > Installation examples"

The VSE all-in-one solution. Controlled by twilight, timer and manually; powered by a solar cell and NiMH rechargeable batteries. Doorkeeper VSE - Solar version > a solar cell is fitted + NiMH rechargeable batteries installed, instead of the standard alkaline batteries. Reliable, safe operation, regardless of the weather or time of year – even when the sun takes a break. The device operates even more independently of its installation location. Installation in sunlight or with good daylight illumination is required. Alternatively: Connection of external solar cell "Solar2b" possible. Automatic summer time adjustment, different switching times at weekends or on Sundays only, twilight delay (closing at dusk after nightfall), operation without mechanical buttons, up to 3kg slider weight, efficient battery operation. Opens and closes when it gets light or dark.Light sensor is built into the device. No extra light sensor required if the device is mounted on the outside of the coop.If the Doorkeeper is mounted inside the coop, please order a sensor extension, the external light sensor (ASb), in the appropriate length as well.The sensitivity of the sensor is easy to adjust so that it can be adapted somewhat to the installation location and the behaviour of the animals.Twilight delay (closing 1 to 90 minutes after the device has detected darkness, maximum 23:45) Integrated timer with display and menu controlWeekend function (Saturday and Sunday and/or Sunday different settings possible)Separate settings possible in the morning and evening (open until 12:00, close from 12:00 to 24:00)Operation from outside via magnet, your key to the device Close AND open manually if requiredA magnet is held against a control panel on the device, which triggers the function (closing or opening).Control panel for magnet extendable (ext.SA) = manual control, even if the device is installed in the coop. If required, please order ext.SA in the appropriate length at the same time. Battery operation4x AA alkaline batteries (AA, LR6), inexpensive and available in any supermarket.Battery life approx. 2 years.Independent of mains sockets, for example for mobile chicken coops.Low battery indicator (LED)Further information:External light sensor (1 to 6 metres) can be connected (optional) – for mounting the device in the coop Extension of the manual control (1, 3 and 6 metres) possible (optional) – manual control also possible when mounted in the coop Optimised mechanism – less strain on the cord Flap stops if a chicken is underneath it. It continues closing when the animal has moved away again. up to 3 kg slider weight 12V power supply available as an accessory (optional) – operate the device via 230V mains socket power, batteries can remain in the device as an emergency power supply1x control magnet is always included in the scope of delivery. If you need a Doorkeeper with which you want to open a pasture gate, then please take a look at the pasture gate openers BZ1, BZ3 (click on designation). These are the perfect combination for this application. In some cases, the VSE is not suitable for equine applications. A great deal is possible with the VSE. There is a suitable setting for every chicken keeper. Benefit from our top customer service, Made in Germany quality and long warranty periods. The devices can be mounted flexibly and offer a top price / performance ratio. You operate the menu via a control magnet on the front of the lid. The housing does not need to be opened and there are no mechanical components that could break. Quite an elegant solution. You can place the magnet on the device; it stays where it is.     Manual operation Close the flap by holding the magnet against the housing or the extension. The flap remains closed until the next morning and then opens again automatically - without you having to do anything.Or open the flap again the same day. It also closes automatically that evening. LED display: The device outputs status information via an LED in the housing. For example that the flap must be closed according to the limit switch position (for a limited time). The batteries need to be changed. A condition is present that requires your attention. The LED displays are output for a limited time. This saves power and prevents disco lighting at night in the chicken coop. Installation Installation is very easy: first mount the slider, pull it into the open position, mount the VSE so that you can connect it to the slider via the loop (rolled-up cord = delivery condition!). Then insert the batteries and that's it. You can also control several sliders with one VSE via deflection pulleys "UR" (see installation examples). Variants and examples for installation of the electronic Doorkeeper VSE can be found here.  

The VSE all-in-one solution. Control via twilight, time and manually. Automatic summer time adjustment, different switching times at weekends or on Sundays only, twilight delay (closing at dusk after nightfall), operation without mechanical buttons, slider weight up to 3kg, efficient battery operation. Opens and closes as it gets light or dark.A light sensor is built into the unit. No separate light sensor is required if the unit is mounted on the outside of the barn.If the Doorkeeper is to be fitted inside the stable, please order a sensor extension – the external light sensor (ASb) – in the appropriate length.The sensor’s sensitivity can be easily adjusted, allowing it to be tailored to the installation location and the animals’ behaviour.Twilight delay (closes 1 to 90 minutes after the device has detected darkness, up to a maximum of 23:45) Integrated timer with display and menu controlWeekend function (Saturday and Sunday, and/or Sunday – different settings possible)Separate settings possible for mornings and evenings (open until 12:00, close from 12:00 until midnight)External operation via magnet – your key to the device Close AND open manually if requiredA magnet is held against a control panel on the device, which triggers the function (closing or opening).Control panel for extendable magnet (ext.SA) = manual control, even when the unit is installed in the barn. If required, please order the ext.SA in the appropriate length at the same time. Battery operation4x AA alkaline batteries (AA, LR6), available at low prices in any supermarket.Battery life approx. 2 years.Be independent of mains sockets, for example for mobile chicken coops.Low battery indicator (LED)Further information: An external light sensor (1 to 6 metres) can be connected (available as an optional extra) – for installing the device in the barn Extension of the manual control (1, 3 and 6 metres) available (optional) – manual control also possible when installed in the barn Optimised mechanism – less strain on the line The flap stops when a chicken is underneath it. It continues to close once the bird has moved away. up to 3 kg slider weight 12V power supply available as an accessory (optional) – operate the unit via a 230V mains socket; batteries can remain in the unit as a backup power supply One control magnet is always included in the scope of delivery. If you need a Doorkeeper to open a pasture gate, please take a look at our range of pasture gate openers BZ1, BZ3 (click on the name). These are the perfect combination for this application. In some cases, the VSE is not suitable for equine applications. The VSE offers a wide range of possibilities. There’s a suitable setting for every poultry farmer. Benefit from our excellent customer service, ‘Made in Germany’ quality and long warranty periods. The units can be installed flexibly and offer excellent value for money. You operate the menu using a control magnet on the front of the lid. There is no need to open the casing, and there are no mechanical components that could break. A thoroughly elegant solution. You can place the magnet on the device; it stays exactly where you put it.     Manual operation Close the flap by attaching the magnet to the housing or the extension. The flap remains closed until the following morning and then opens again automatically - Without you having to do anything.Or open the flap again on the same day. It will also close automatically that evening. LED display: The device displays status information via an LED in the housing. For example, that the flap must be closed according to the limit switch position (for a limited time). The batteries need changing. There is a condition that requires your attention. The LED displays are shown for a limited time. This saves electricity and prevents the chicken coop from being lit up like a disco at night. Installation Installation is very simple: first fit the slider, pull it into the open position, then fit the VSE so that you can connect it to the slider via the loop (cord rolled up = as supplied!). Then insert the batteries and you’re done. You can also control several sliders with a single VSE using ‘UR’ pulleys (see installation examples). You can find variants and examples of how to install the Doorkeeper VSE electronic door entry system here.  

Electronic Doorkeeper for control via an external socket-mounted timer (power on = open, power off = close) !  Important note: the required external socket timer is not included with the Doorkeeper. Please use one that suits your needs. Leave the work to your new electronic Doorkeeper. Automatic chicken coop flap control unit with a 12V power supply for operation from a mains socket via a socket-mounted timer The device allows you to control your chicken flap, for example, using your own simple socket timer or a Wi-Fi socket. For example, you could use a simple analogue timer switch from a DIY store. These are extremely easy to set up and are perfectly adequate for most applications. Do you have Wi-Fi in the henhouse and a power socket? Use a Wi-Fi socket timer to integrate your hen flap into your Wi-Fi network, or into your own preferred smart home system. Make use of the wide range of control options offered by your own Wi-Fi sockets to control the chicken flap remotely, e.g. whilst on holiday, in much the same way as you would control a lamp via Wi-Fi. For example, use the astro function on some socket timers to control it based on twilight. Simply switch the power on or off remotely to control the flap manually. Use the setting profiles in the timer app to set different switching times for different days.  Closing takes place relatively slowly, whilst opening is comparatively quick. This behaviour is advantageous, as the animals want to leave the barn early in the morning. The maximum weight of approx. 2 to 2.5 kg on the device should not be exceeded. Notes: Please note that the required socket and the power supply unit must be installed in a dry indoor location. When using the 12V power supply, the overload cut-out activates relatively late. There is a risk of injury if any part of the body becomes trapped between the chicken flap or the object being opened and the device. Do not reach into the loop or between the loop and the device whilst opening. This is not a toy! Use in the presence of children should only take place under supervision! Up to 2.5 kg slider weightQuick and easy to installIdeal if you want to use your own socket timer, or if you want to integrate the chicken flap into a Wi-Fi network Sliding panels and doors are optionally available in up to three different sizes Pull cord designed for long-lasting durabilityNever be late for work again because you had to open the chicken flap first thing in the morningSave yourself extra trips and a lot of timeSave yourself arguments with your neighbours over your feathered friendsMake the most of your Sunday breakfast with your familyContinue to benefit from: Top-class customer service from a German manufacturer based in the heart of Germany(relatively short communication channels, direct contact, straightforward solutions) Fast service from a dedicated team Further options – optional or alternative items: Note: There is no control option on the device itself. A socket timer and, accordingly, a socket near the Doorkeeper are required. To connect to a Wi-Fi network, a suitable Wi-Fi signal is required for a Wi-Fi socket timer. Alternatively, any socket timer (230V, 50Hz) can be used. The mains adaptor must only be used indoors in a dry environment! Alternative product: VSF, chicken coop flap controller with integrated manual timer (just as easy to set as a standard DIY shop socket timer), and power supply via solar cell/internal rechargeable batteries. References: Axt-electronic’s electronic Doorkeepers operate worldwide, from cold Canada to the hot Australian outback. The poultry houses at the BDRG’s Scientific Poultry Farm (www.bdrg.de) are equipped with our products. Installation: Installation is very simple: first fit the slider, pull it into the open position, then fit the VSF/r so that you can connect it to the slider via the loop (cord rolled up = as supplied!). Then activate the rechargeable batteries - done. You can also control several sliders with a single VSF/r via UR pulleys (see installation examples), provided the maximum total weight is not exceeded. Examples of how the VSF/r control unit can be fitted can be found here.

Manufacturer:AXT-electronic GmbH & Co. KG, Wartburgstraße 10, 99817 Eisenach, Germany VSF electronic Doorkeeper – with with an analogue timer and solar power (4x NiMH rechargeable batteries). Reliable, secure operation, regardless of the weather or time of year – even when the sun takes a break. Let your vertical gate in the poultry house automatically Flexible and straightforward installation, very simple to set up. A overload protection prevents damage in the event of temporary blockages (e.g. a frozen sliding door). By using limit switches in the unit, there is no danger to animals located beneath the closing gate. It simply stops and then continues to close once the animal has moved away. The electronics are protected by a special coating. Up to 1.5 kg possible. Flexible installation possible using accessories. Further accessories, e.g. an external solar cell for indoor installation with a 2 m cable, will be available in future. HS, mHS, gHS and bioHS gates – gates + rails in four different sizes for the most common poultry breeds. Various mounting options are available through the use of pulleys. The 4 required batteries are included and simply need to be activated.  Safety instructions Not a toy; please keep children away from the device. Contains NiMH rechargeable batteries: please observe the disposal instructions. A mains power supply connection can be fitted as an option. Risk of injury inside the unit when the motor is running, due to moving mechanical parts   Batteries/rechargeable batteries may leak (in which case, remove them whilst wearing gloves) Mains adaptor designed for indoor use; do not use in outdoor sockets Risk of injury when opening the flap; do not place your hand between the opening flap. The system shuts off at approx. 1.5–2 kg; risk of injury Information on the battery and the timer Automatic chicken flap control with rechargeable batteries, which are charged via an integrated solar cell . (Operates, for example, for up to 4 months even during the darker months of the year) independent of mains sockets, e.g. for mobile chicken coops To Charging the batteries , the installation site must be exposed to daylight. Charging via a suitable charger for NiMH batteries is also possible Even without sufficient sunlight, the chicken flap is powered by the batteries for up to 4 months Reliable, safe operation, regardless of the weather or season – even when the sun takes a break.   Closing time is set using the analogue timer easily and relatively quickly 96 switching segments, each representing 15 minutes of switching time Multiple switching times per day can be set The setting applies all days of the week up to 1 kg, approx. 65 cm stroke Your benefits: Never be late for work again because you had to open the chicken coop first thing in the morning. Save yourself extra trips and a lot of time Save yourself arguments with your neighbours over your feathered friends Make the most of your Sunday breakfast with your family You can also benefit from: Top-class customer service from a German manufacturer based in the heart of Germany(relatively short distances, direct contact, straightforward solutions) Fast service provided by a dedicated team Optional or alternative items In future, an external solar cell . Provided the device is mounted inside the stable or in a location that is too shaded, the external solar panel will be required to charge the batteries. Note: Manual or twilight control is not possible. References Axt-electronic’s electronic Doorkeepers operate worldwide, from cold Canada to the hot Australian outback. The The poultry houses at the BDRG’s scientific poultry farm are fitted with our products. Installation Installation is very simple: first, fit the gate, pull it into the open position, then fit the VSF so that you can connect it to the gate via the loop (cord rolled up = as supplied!). Then activate the batteries – and you’re done. You can also control several sliders with a single VSF via UR pulleys (see installation examples), provided the maximum total weight is not exceeded. Variants and examples of how to install the VSF electronic Doorkeeper (and others) can be found here. Contents of the pack: Electronic Doorkeeper VSF including 4 AA NiMH rechargeable batteries.