... ,Unlock by password,card,button 2.Intercom, call other monitors,surveillance outsid Product name: Super Thin 7 Inch Color ... , audio and video communication.3. Unlock, intercom, call other monitors, surveillance outside4. 6 infrared LED lights, External power adaptor5. Connection ... It supports up to two cameras.8. Four colors for monitors: Silver, Red,Blue,White9. With functions of time attendance ...