... battery during power failure Two network PSTN and GSM alarm system 1. Large LCD English blue back-light display ... (phone) long-distance telephone control for arming, disarming, monitoring, remote announcement. 11. One Set of normally open signal ... main products are Home PSTN/GSM Security Alarm System, 3G Alarm System, GSM Power Alarm, Video Monitoring system, Wireless Remote controller, RF Transmitter ...