... Available color: grey,red,white stored photos 3.5” Wireless video door phone Wireless +3.5inch screen +Record + Alarm +Waterproof Advantage: ... pictures of visitors with date and timeAlarm function,anti-steal Wireless ,no need wire cable Both wall-mount and desktop ... unit with battery to work Description :2.4Ghz frequency,wireless transmission range is up to 350meters without obstructions.Indoor units ...