... pulse signal support GPRS. GSM Fixed Wireless Terminal/FWT Unique Functions1,GSM cellular network outgoing.2,GSM cellular network incoming.3 ... GPRS . (Optional)9,Rechargeable battery, keep conversation for at least 3 hour when out of mains supply. (Optional) ... billing meter. (Optional) Technical Specifications1,Work frequency: GSM 900MHZ/1800MHZ or GSM 850/900/1800/1900MHZ2,Power: ≤2 W3,Sensitivity: ...