An alarm system can’t just go off when anyone enters. There has to be a way to allow authorized people to switch it off. Technology is advancing very rapidly and researchers and engineers are working on different methods of authentication. (If you think of your favourite action film it probably has a scene with fingerprint or eye-sensor authentication.) Despite these advances, entering a code into a console is still by far the most common way of authentication. But how does the alarm know an unauthenticated person is entering?
Naturally, doors are the main entry points to buildings and so are in the first line of defence when it comes to sensors. The most common way of knowing a door has been opened is with a small, magnetic sensor installed in the door and door-frame. These contact strips are usually (though not always) wired to the main system. The main system can then also tell which doors are not secured properly.
Glass break detectors
Glass break detectors do just what is in their name – they can tell when a glass panel (usually in a window or door) has been broken. If a window is protected from opening by contact sensors, just like doors, and by glass break detectors, it is virtually impossible for someone to gain entry through it without the alarm system finding out.
Motion detectors can be an important part of home or commercial security, whether inside our outside the building or home. Outside motion detectors may cause trouble or need some extra configuration in order not to trigger false alarms. Those raccoons really are a nuisance when it comes to motion detectors outside. Inside there is not much else that might trigger an alarm.
Panic buttons and alarms
Panic buttons and alarms are a way of alerting authorities, usually without alerting intruders. It is the easiest way to call for help and can be very significant in the very frightening circumstances that they are often used in. They are usually connected directly, through phone lines or other means, to a dispatcher.
There are also countless other security devices, often coupled with technology that limits entry. Each system is only one of a set of tools and although no system is foolproof, each extra component adds an extra bit of security. This is in addition to fire and other disaster systems that all work together for your safety.