A vehicle alarm is a relatively simple device. At the most basic level, car alarms are made up of three key components, which include the control unit, siren, and several sensors. But in order to function more efficiently, some car alarms come with other devices and components like motion detectors, radio receivers, pressure sensors, and auxiliary batteries. These enable car alarms to work even if the car battery is cut off.
The brain, or the control unit, is the main part of a vehicle alarm system that is connected to the sensors installed in different parts of the car. It is designed and utilized to monitor the sensors and then it activates the siren when the sensors are tripped.