The Coop Controls CKBT Automatic Coop Door Opener Kit is the complete kit to automatically open swinging coop doors that are 16-30 inches wide. The integrated photocell automatically opens the coop door at sunrise and shuts it at sunset.One weatherproof system box with the coop controls CKBT system controller and battery box,One 12V rechargeable sealed lead-acid battery,Slotted and adjustable front mounting bracket,Operator arm,Rear mounting arm hinge,Second hinge for door stability,UL listed resettable AC transformer with low voltage wire,Non-illuminated pushbutton with low voltage wire,Mounting fasteners for system controller box, mounting brackets and hinge