Automatic Chicken Coop Door - ElectricSuitable for standard, exotic and heritage backyard chicken breeds. For large chicken breeds such as Brahma, Jersey Giant, and Cochin, consider our Large Automatic Chicken Door. Automatically opens your coop door at dawn and securely closes it at dusk, or schedule door open and close times. Solid Steel Acme threaded worm drive for dependable operation. 10 x 10 in. (25 x 25 cm) door opening. Programmable coop door controller: Program custom options,