Features: 1) Siemens TC35I industrial module from Germany 2) Based on mobile GSM network 3) Provides fixed phone set access port and converts the wire signal to wireless signal to GSM network 4) Solution for the problem of application to the communication of remote areas, and it is also the best choice of long distance communication on the trains, ships, buses, public telephones and other vehicles, where wire line cannot be accessed 5) Embedded GSM900MHz/1800MHz wireless communication modules 6) Has high output power and sensitive receiving radio in the GSM network 7) Compared with common GSM network mobile phones, it has strong signal and voice quality transmission, therefore can provide clearer and more natural voice 8) Has compact pattern, exquisite appearance and convenient operations 9) Suitable for 900/1800MHz public mobile telephone networks, using SIM car 10) Connects with telephones that can dial international, national, local and GSM calls 11) Four channels are in one terminal and share one antenna 12) Multi-antenna are also compatible 13) Can answer incoming calls 14) Detects called party answer, and provides exact polarity reversal signal for charging 15) Caller ID 16) Dialer function inside, programmable call routing (such as you can set 193 or 17911 IP phone when launching long distance call) 18) Can provide integrated telephone tone 19) Supports functions of redialing and hands-free 20) Multi-lever volume to be chosen 21) Wireless signal indicator available 22) Possess agile function for setting up parameters 23) Can proceed with setting up and modification of parameters through phone set or PC 24) Standby battery supported (optional) 25) Double security by phone password and start-up PIN code