... -reverse,12 or 16 KHz pulse signal 3)support GPRS 8 line Wireless Terminal Unique Functions1,GSM cellular network outgoing.2,GSM ... /16KHz pulse for billing meter while connection is also compatible.8,Support GPRS . (Optional)9,Rechargeable battery, keep conversation for at ... 5Vadapter AC 110~240 input7,DTMF Receive: > -23dB insure receiving.8,DTMF Receive sensitivity: 99.99%9,Insertion loss: ≤0.5dB