4'' B/W CRT screen 
Hands-free design 
ABS Plastic case 
Surface mounted 
Monitor, intercom & door release 

Specifications 
Outside Dimension: 230 x 198 x 48mm 
Power requirement: DC 18V@800mA 
Standby Current: ≤ 25mA 
Working Current: ≤ 600mA 
Working Temperaturº C: -10º C~40º C (-22º F~131º F) 
Working Humidity  : 45%~95% 
Pixel: 105600 dots 
Distortion: ≤ 5% 
Power consumption: 0.2 W ( standby ), Max. 9W 
Call signal: Electric chime 
H. Resolution: 420 TV Lines 
Sound Level: ≥ 70dBA