... 1.PSTN transmission 2.wired 4+2, wireless 14 3.GPRS supported 4.Contact ID Contact ... info, like 08281400 (2PM on Aug. 28th)14 wireless Zone for the Magnetic door detecor, infrared beam, infrared detector, ... 2 expand zone.With the addition of GPRS wireless unit, become 2 way networking alarm system: ... PSTN wired and GPRS wireless which both send event data to the alarm center ...