Car alarm system
A car alarm system is a system that prevents the car itself or the items on the car from being stolen. It consists of an electronically controlled remote control or key, electronic control circuitry, alarms and actuators. The earliest car door locks were mechanical door locks, which were only used to prevent the door from opening automatically when the car was running, and only had an accidental effect. With the advancement of society, the development of science and technology, and the increasing number of car ownership, the doors and doors of cars and trucks that were later manufactured were equipped with key locks. This kind of door lock only controls one door, and the other doors are opened or locked by the door lock button on the inner door.