Specification :

1) 3.5 or 4 inch TFT monitor.luxury cast iron camera.can unlock by ID card, by password, by key.
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 4 monitors)