Commax CDV70K+40K 7inch TFT LCD screen Video Door Phone With Handset. 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) .7 inch wide color LCD, Surface-mounted type, Door camera-Interphone: 4 wires(Polarity), Distance: Door camera: 50m(0.65Ø), Interphone: 20m(0.65Ø), Consumption Max.16W/standby 3.9W, Dimension(mm) : 311(W)×168(H)×32(D).