Brinsea Products Chick Safe Premium Automatic Chicken Coop Door Opener, Grey/Yellow All-In-One design with integrated timer and light sensor - no complicated wiring or limit switches Full manual door control and unique failsafe mode 5 to 120&deg;f temperature operating range 2.5&nbsp;Lbs. Door lifting capacity suitable for most door configurations Low battery indicator and door closed indicator visible 100 yards away