1. 4' flat B/W CRT monitor. 2. CMOS camera,handset,audio and video communication. 3. unlock, intercom, call other monitors, monitor outside 4. 6 LED lights,External power adaptor. 5. Connection: 4 wire (Up to 5 monitors) Remarks:if need CCD B/W camera.please add 6USD per pcs;if need one more monitor,please add 25USD