Commax CDV70K 7 inch TFT LCD Screen Colour Video Monitor. 7 inch TFT LCD screen with Video talk and door lock release enable (both individual and public entrance). Expandable up to 2 monitors with 2 CCTV cameras and 2 door cameras, Memory storing in SD memory (CDV-70KM).Wiring Door camera: 4 wires(Polarity), Interphone: 4 wires(Polarity), Distance Door camera: 50m(0.65Ø), In, terphone: 20m(0.65Ø).Consumption: Max.16W/standby 3.9W, Dimension(mm): 311(W)×168(H)×32(D).