GM Genuine Parts Keyless Entry and Alarm System Remote Control Transmitters are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These transmitters, found in the key fob, help provide the ability to lock or unlock your vehicle's doors or engage the anti-theft alarm system. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).