1. 4'or 3.5' TFT 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 SONY CCD camera.please add 10USD per pcs;if need one more monitor,please add 65USD