... phone 1.door unlocking,handsfree 2.supporting 4CH video in,1CH video out 3.touch key,IR night vision The latest 7 inch ... wired color video door phone 1.unlocking,handsfree.night vision 2.support 4CH video in, 1CH video out 3.high resolution ... voice hint)4. No radiation, low consumption and high resolution 5. Monitor, intercom, unlock, hand-free and multi-melody.6. Able ...