7" Color Video Door Phone 1.Time Attendance,Unlock by ... monitor.only 1.85cm, plastic camera2. CMOS camera, handfree, audio and video communication.3. Unlock, intercom, call other monitors, surveillance outside4 ... 4 wires6. One camera can support up to 4 monitors7. It supports up to two cameras.8. Four colors for ... time attendance machine, unlocking by card, passwords and buttonCertificates:CE,FCC,RoHS