... system bases on the GSM network products introductionFunction Instruction:4 wired and 12 wireless defense ... main unit can be used as a telephone;Arm, disarm, monitor, and intercom by phone;Real-time, Delay, 24 hours, Bypass ... /1AStandby Current:<55mAAlarming Current: <450mAWireless Frequency:315MHz, 2262/4.7MΩGSM Frequency:900/ 1800/ 1900MHzBack-up Battery:NI-HI AAA*6 ...