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Description:Main features 1. GSM 850 / 900 / 1800 / 1900mhz 2. Connecting metering box for payphone use 3. User-friendly installation; plug & play 4. 2-phone connection 5. LED indicators for signal strength, status and power 6. SIM card locking and network locking 7. Reverse polarity signal support 8. Dtmf and pulse dialing 9. Emergency battery back-up 10. SMS (optional) 11. USB connector for PC connection (optional) 12. GPRS data transmission (optinal) Technical specification 1. Air interface: GSM phase I / GSM phase II compatible 2. GSM frequency: GSM 850 / 900 / 1800 / 1900 MHz 3. Rf transmit power: 2w (900 MHz) , 1w (1800 MHz) 4. Rf sensitivity: <-100 dbm 5. Electricity power supply: input: ac100~240v / 60hz; output: dc12v / 600ma 6. Optional 6-pcs ni-mh re-charged batteries 7. LED indicators: power / signal strength / network status 8. Connectors: rj-11 interface jack for telephone, USB interface jack for PC (optional) , sma antenna connector, DC power input jack 9. Antenna: 2dbi omni antenna, high-gain antenna and cable as optional