... 13melodies for choice, competitive factory price Name:LRK-682B 4"TFT door phone video entry system Features:Aluminum alloy ... disassembly,anti-hit,waterproof,wearable zinc alloy outdoor station.4"TFT,nonradiative,energy saving and high definition picture and ... easy to install. Details:Outdoor unitDistance of infrared radiation shall be not less than 4 meters.Plus control:autoWorking temperature: -10C ...