1. It is suitable for the villa with one door and three rooms.  Sounds from two indoor units will be heard and image will be presented on the video indoor units when someone presses the button of outdoor unit.
2. Camera of outdoor unit is adjustable in four directions:up,down,left and right for best view.
3. 7-inch display is with high definition ,low power consumption ,no radiation
4. Waterproof  and damage-proof aluminum alloyed panel of  outdoor unit.
5. Rainshield  for the outdoor unit is available.
6. 8-chord melody for option.
7. Hands-free intercommunication .
8. Electric-controlled unlocking.
9. Monitoring the outdoors .
10.Adjustable chroma and brightness.
11.Adjustalbe volume of melodise and intercommunication.
12.Enclosed 15m cable and  an adapter for DIY.
13.High definition with CCD camera.