Basic Functions:
Calling: A call tone will alerts occupant
Monitoring: You can see the caller on the screen
Dialogue: Pick up the handset to talk
Remote release: You can unlock the door by electrical lock

Additional Functions: (option)
Additional monitors: Up to 4 monitors
Inner calling and dialogue

Specification:
Power: DC 14V
Displayer: 4" color TFT LCD
Resolution: 450TV Line
Camera: CMOS ( CCD optional)
Illumination: 1. 0 Lux
Power consumption: 12W
Operating temperature: -25-75
Installation: Wall-mount

Packing:
Package: 1pc/box, 6pcs/carton
G/W: 19kg, N/W: 17kg
Dimension: 60*45*33cm/ctn