1. 5.6"or 7" TFT Screen 2. Talk+Monitor+Unlock 3. Waterproof and prevent dust design 4. Plastic camera 5. For villa system 6. Call indoor monitor 7. Effective resolution: 1440H*234V (7"),960H*234V (5.6") 8. Ring way: Ding dong ring or Chord are optional 9. Match way: One to one, One to two