... Intercom System GAI-313 Video Intercom System 4'' flat B/W CRT monitor. CMOS camera,handset,audio and video communica Detailed Product DescriptionVideo Intercom ... 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, ...