Warning devices: An audible or visible device that lets thieves know your car is protected. Examples include tire locks, tire deflators, steering wheel locks, laminated glass, and audible alarms.
2. Immobilizing devices: They prevent thieves from hot-wiring the car and bypassing your ignition. Smart keys, kill switches, fuse cut-offs, etc. are a few examples.
3. Tracking devices: When a car is stolen, they send a signal to the police or a monitoring centre.