What a great product! Used in Europe for years. Foy's is proud to be your distributor in North America. Foy's truly believes that many different uses will be found for this Electronic Doorkeeper. Cat and dog owners may use it to open and close an entrance to the dog house, garage or out building. Poultry fanciers may want to use it to allow the flock to go outside and then close it when it gets dark. Pigeon fanciers will be able to allow a door to open at dawn and close it at a chosen time later. Pigeon racers may use it when flying the darkening system, or perhaps if you have a special use, you can let us know. This automatic control device can be used wherever a vertical sliding gate is to be opened and close to respond to light conditions at dawn and dusk. The sensitivity of the system is adjustable. Using one of our timers, it is not only possible to open and close the sliding gate according to the time setting or to open and close it in response to light conditions, but it is also easy to set a maximum for the closing time. Other uses for the Electronic Doorkeeper is poultry houses, dog and cat entrances, etc. Perhaps you want an animal to be released at a certain time, after you leave for work for example. Just set the time and it will open. You can close it at your convenience or set a time for it to close automatically. The unit will lift a door weighing up to 7 pounds! The door lift moves 1 inch per 5 seconds. Should you choose to use your own door, the 1 year warranty will not be honored. If the doorkeeper/timer is altered in any way, your warranty will be voided. Batteries not included.