video door phone

5 Wire system Video door phonefor less than 16 apartments building: 1. Outdoor camera with 6 buttons, and there are space beside the button for you to wirte the host name or room number. 2. Indoor monitors can use our 4 inch handset modle: LSD-892R01PC or 7 inch handfree modle: LSD-892R11PC or LSD-892R07PC. 3. This system is use RVVP4X0.5+RVVP4X0.75 cable. It is more easy to instal and save the cable cost. You can DIY by yourself. 4. When standby, there is no power for the indoor monitors. It will save a lot of power and benefit for envirronment, extending the using time of the goods. 5. You can use the video or audio indoor monitor in one building. 6. Each floor will have a signal allotment to sepearate the signal and protect them. Such as when there is something wrong on the second floor, you just need to cut down the second floor and repaire, no need to cut off the whole building power.