7 inch video door phone

Four wire Color Video door phone(One camera connect to three monitors. video intercom system,video interphone) (monitor and camera can be changed for other models) Specifications: 1) Dimensions (W x H x D):230 x 165 x 40mm 2) Four-wire system 3) Power supply: 13.5 V DC / AC 110V 240V 4) Material of outdoor unit: aluminum alloy casting 5) Handsfree monitor 6) With powersupply built-in door phone Features: 1) 7" TFT LCD display in high resolution;no radiation 2) Video intercom system with Low power consumption. 3) Intercommunication 4) Electric-controlled unlocking 5) Monitor outdoor. 6) LED lumination compensation 7) 16 chord melodies for ring 8) Water-proof, damage-proof & explosion-proof outdoor unit 9) Unique anti-theft design 10)12 chord melodies for ring. 11)Installation method: surface-mounted. 12). Brightness, volume and chroma are adjustable. 13). One camera can be connected to up tothree monitors and the monitors can talk with each other. to satisfy you to know the visitor from the living room, bedroom and kitchen etc. 14). It can also support two outdoor cameras to make the visitor can call you from front door or back door. 13.Installation method: Surface Mounting 14.Power consution: Standby:05W; Operation:13W