Brinsea Products Chick Safe Extreme Automatic Chicken Coop Door Opener, Grey/Yellow Military grade electronics all-in-one design with integrated timer and light sensor - no complicated wiring or limit switches Full manual door control and unique failsafe mode Minus 20 to +120&deg;f temperature operating range 9&nbsp;Lbs. Door lifting capacity suitable for most door configurations Low battery indicator and door closed indicator visible 100 yards away