SYSTEM 7 main functions:

1. One door station can support four hundred indoor phones at most.
2. With infrared LED inside,which can help you easily indentify visitor at night time.
3. Network application optional.
4. When in network system,the door station can have a dual communication with the management unit.
5. Remote unlocking and three kinds of chord melody rings optional.
6. Please see the pictures for those indoor phones shown on the right(Character: Indoor phone).