Security has always been a hot issue of concern. Most of today's home security systems are based on cameras or sensors. These systems have challenges, such as involving in users' privacy and high ...

According to the fire alarm system and the problems that the CRT, puts forward the automatic fire alarm system based on GIS graphic display CRT and discusses its implementation process. Firstly ...

The UK will test its emergency alarm system for the first time in two years, as the Government warns Britain to prepare for war.