the knowledge: car alarms - car alarm system
The essence of any car alarm is the siren, usually installed in the engine compartment, but away from extreme heat and water.
It is important to protect the siren, because if the siren is blocked by a thief, the alarm system will not be of any use.
The most basic car alarm will protect the alarm by making sure that if the hood is turned on, the alarm will be triggered.
It also monitors whether the start or the door is open.
This type of alarm works by connecting to a miniature switch that opens the courtesy light when opening the door.
If the light switch is activated, the alarm will sound.
This system will not protect you if the door is not opened.