Automatic coop doors usually have two modes of operation - light sensor and timer-based. Doors with light sensor technology will automatically open at sunrise and close at dusk or dark. On the other hand, if you have a coop door with a timer, you can configure what time you want them to open or close. The timer comes in handy, for example, if you have doors installed in a darker environment and you want them to open sooner, or if you have a specific breed of chicken that needs to stay outside longer. Both technology variations have their advantages and disadvantages, so we recommend a door with a light sensor and a timer-based option. Run-Chicken automatic coop door has a high-tech sensor that excludes all artificial light sources, such as sensor lights, street lights, and flashlights. In addition, door technology automatically detects your time zone. It is also possible to program the opening and closing time using a button on the unit.