... 8 line Wireless Terminal 1)lock card,lock terminal 2)support polar-reverse,12 or 16 KHz pulse signal 3)support GPRS 8 ... line Wireless Terminal Unique Functions1,GSM cellular ... billing meter while connection is also compatible.8,Support GPRS . (Optional)9,Rechargeable battery ... input7,DTMF Receive: > -23dB insure receiving.8,DTMF Receive sensitivity: 99.99%9,Insertion loss ...