Home security alarms are nothing but devices that are designed in order to detect the illegal entry into your home. There are many varieties of such alarms, but they are categorized into two types such as monitored alarms and bell only alarms. The bell only alarms create a high pitch siren when someone has breached the home security system. The purpose of this type of alarm is two fold. One is that the loud siren can act as a vital deterrent to the continuation of any criminal threat by intimating the intruder that the home security breach has been detected. The other one is the alarm is of a high frequency that makes it uncomfortable for the intruder to stay in your house.
The next purpose of the bell alarm is to let others in the vicinity know that the home security system has been breached. It is a good feature, but it will not be useful if you are not in the house. On the other hand, the monitored home security alarms are the best and most advanced home security system available these days. Such systems sound either silent alarms that are not audible to the intruder or bell alarms that are high pitched and audible. The purpose of such silent alarms is to make the intruder believe that the security breach was not detected and let the local police or security company catch the person red handed.
Irrespective of the type of the home security system that is used, both audible and silent type monitored security alarms have the same functionality. The monitored alarm systems pass on the information about the security breach to a central monitoring station via phone alerting the concerned security company. The company will then dispatch its security guards to visit the premises and get to know why the alarm sounded.