7" Color Video Door Phone 1.Time Attendance,Unlock by password,card,button 2.Intercom, ... , handfree, audio and video communication.3. Unlock, intercom, call other monitors, surveillance outside4. 6 infrared LED lights, External power adaptor5. Connection: 4 ... cameras.8. Four colors for monitors: Silver, Red,Blue,White9. With functions of time attendance machine, unlocking by card, passwords and ...