GSM 850/900/1800/1900 MHzLED indicators for singal strengh, network and powerReverse polarity signal supportingDtmf and pules dialingBattaries back-upSMS (optional)Payphone metering pulse supporting (optional)GPRS data transmission (optional)
GSM 850/900/1800/1900 MHz
LED indicators for singal strengh, network and power
Reverse polarity si