1.Based on GSM900MHz/1800MHz

        2.Siemens GSM module

        3.Support Data Interface

        4.Support reverse polarity

        5.Connect to PBX 

        6.Send and receive text messages connecting to a computer

        7.Access GRPS connecting to a computer

        8.Fixed wireline and wireless telephone networks could be used,and the switches are automatic

Main Functions:

1. Suitable for GSM 900/1800MHz, using SIM card 

2. Make and answer calls

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

4. Caller ID

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

6. Support redialing and hands-free

7. Support voice adjustment and multi-lever volume to be chosen

8. Optional to match with various high-gain antennas

9. The indicators for signal intensity ,working status ,breakdown and so on

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