... financial offices and departments of electricity, .1: Wireless GSM alarm of L&L-819B1: 99 wireless + 7 ... be used as a telephone; 9. Arm, disarm, monitor, and intercom by phone; 10. Real-time, Delay, ... .2V Siren Volume: 110dB 4: Stardant kits of GSM alarm systemGSM panel * 1Remote controller * 2wired mini ... . What's the difference from other GSM alarm system? The GSM Burglar alarm system can edit SMS and ...