2. Making & answering calls after connecting to telephone set
3. Available to connect with telephone set, PBX, Billing machine, etc
4. Caller ID

5. Built-in PIN code protection featured with locking device/card/network

6. Supports the functions of redialing and hands-free

7. Voice adjustment of calling in and out

8. Featured with indicator of signal intensity, working status, breakdown, etc

9. Setting up and modification of parameters through the phone set