Harper invents personal car alarm.

This article focuses on Personal Car Alarm, a device that can be carried on the person of automobile owners to alert them when someone is tampering with or stealing their motor vehicle. Invented by Edward Harper, this device contains two compact battery-operated components, including an infrared light emitter and radio frequency transmitter unit and a compact radio frequency receiver and alarm unit. The emitter and transmitter unit is to be installed in the automobile, while the receiver and alarm unit is carried by the vehicle's owner.