A security Alarm System is comprised of a main central Panel (the heart of the system), Keypads, Sensors and Detectors, Sirens and Sounders and Flasher, and of course the Phone/GSM Dialler to get alarm notifications/calls/sms/messages out to the users. All of which are powered by battery backups. Professional alarms systems will have certification, for example the German standard VDS Certification for security. In addtion, the installer is required to be Licensed and Certified by the Cyprus Police to install Security Systems. Using an installer that is not licensed is not only illegal (for both the customer and the Installer) but also very dangerous to the user.... it could be the burglar that is installing your alarm.... careful!