... Doorbell Waterproof outdoor camera,use it outside 3.5" Wireless digital video door phone Advantage:Indoor unit with 3colors available : ... camera,use it outside Photo function ,record the pictures of visitorsAlarm function,anti-steal Wireless ,no need wire cable Both wall ... unit with battery to work Description :2.4Ghz frequency,wireless transmission range is up to 350meters without obstructions.Indoor ...