1. Based on GSM900MHz/1800MHz
2. Siemens TC35i GSM module
3. Support reverse polarity
4. Can connect to PBX
5. Support Fax

1. Making & answering calls after connecting to telephone set

2. Send/receive faxes through connecting to fax machine

3. Available to connect with telephone set, PBX, billing machine, etc

4. Available to connect with backup battery, and the stand-by time can reach 24 hours in case when the power is cut off.

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

6. Caller ID

7. Optional to match with various high-gain antennas, featured with signal intensity indicator, working status indicator, breakdown indicator, etc

8. Supports the functions of redialing and hands-free

9. Can proceed with setting up and modification of parameters through the phone set.