wireless video intercom 2cameras with 3moniotors remote control,IR vision 300-500meters working disance CE,FCC,ROHS passed wireless video door phone IS ... wake up call ,standly power-sawing sleep5)Unclock door and alarm function6)CE, ROHS,FCC available7)83 effective communication channels, ... SNR voice >55 dB working temperature -20degree+70degree cheap wireless video door phone with high quality