Brief: Color Video Door Phone 1) Wireless communication 2) 4 wire system 3) Handsfree 4) 1 camera to 1 monitor, 1 camera to 2 monitors is available Product describe: 1) Screen size: 4" 2) Power supply: DC 18V 3) Mount type: wall mounted 4) Power consumption: standby: 0.5W; working: 10W 5) Working temperature:-20 ~ 50degrees Celsius 6) Dimensions (W x H x D): 195 x 212 x 54mm 7) Available camera: TK-808C