Features 
4'' B/W CRT screen 
ABS Plastic case 
Surface mounted 
Monitor, intercom & door release 

Specifications 
Outside Dimension: 220 x 200 x 68mm 
Power requirement: DC 18V@800mA 
Standby Current: ≤ 25mA 
Working Current: ≤ 600mA 
Working Temperature: -10º C~40º C (-22º F~131º F) 
Working Humidity: 45%~95% 
Pixel: 105, 600 dots 
Distortion: ≤ 5% 
Power consumption: 0.2 W ( standby ), Max. 9W 
Call signal: Electric chime 
H. Resolution: 420 TV Lines 
Sound Level: ≥ 70dBA