Brinsea Products Chick Safe Extreme Automatic Chicken Coop Door Opener and Door Kit, 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 Low battery indicator and door closed indicator visible 100 yards away 9&quot;X 12&quot; exterior grade aluminum door suitable for most species