... remote monitoring in shops, villas, financial offices and departments of electricity, petroleum, coal, government, public security and other ... automatically recharge. FAQ of the GSM Burglar alarm system:1.What’s the difference from other GSM alarm system?------ The GSM Burglar alarm ... frequence ,900/1800/1900 MHz,so it is available all over the world.4.What is the warranty and delivery time? ------ We ...