Vehicle security systems, such as car alarms, serve as active protective measures for automobiles. These systems monitor various aspects of a vehicle including the doors, trunk, bonnet, and windows, detecting any unauthorized access or disturbances. Upon activation, the alarm system will engage the vehicle's siren and hazard lights to alert the owner. Advanced models may also send notifications directly to the owner's pager or mobile phone. These alarms can be operated using the vehicle's original remote or an optional remote with rolling code technology for enhanced security.