4 line Wireless Terminal 1)lock card,lock terminal 2)support ... 12 or 16 KHz pulse signal 3)support GPRS 4 line Wireless Terminal Unique Functions1,GSM cellular network outgoing.2, ... secondary dial.5,Lock card, lock terminal.6,Send polarity reversal signal for billing meter while connection.7,Sending 12/16KHz ... sensitivity: 99.99%9,Insertion loss: ≤0.5dB 4 line Wireless Terminal/Fixed wireless terminal