1, PSTN security alarm with LED display and keyboard 2,99 wireless and 2 wired 3,Voice prompt function 1, PSTN Voice ... information answer. 13, when the wireless linkage device with alarm, convenient linkage power, lights, video and so on. 14, external siren arming / ... of whether the ring. 15, audio alarm and silent alarm. 16, telephone remote control function; with any phone or cell phone can be ...