Video Intercom System 4'' flat B/W CRT monitor. CMOS camera,handset,audio and video communication. Video Intercom System1. 4'' flat B/W CRT monitor.2. CMOS camera,handset,audio and video communication.3. unlock, intercom, call other monitors, monitor outside4. 6 LED lights,External power adaptor.5. Connection: 4 wire (Up to 5 monitors)Technical Specification:Camera StationItem No.WSX-311CCamera1/ ...