Brief:
Color Video Door Phone
1) 4-inch CRT display
2) 1 camera to 1 monitor. 1 camera to 2 monitors is available too.
3) 4 wire system

Product describtion:
1)4-inch CRT display
2)One camera to one monitor
3)Four-wire system
4)Resolutions: 380 TVL
5)Working temperature: -20 to 50 degrees Celsius
6)Power consumption: Standby: 0.5W, working: 10W
7)Power source: DC 18V
8)Dimensions (W x H x D): 186 x 222 x 55mm
9)Available cameras: TK-809C
10)Voice transmission: Two-way communication