Tip - How to Change the Key Fob Battery for a Car | eHow

Many modern cars come with a remote locking system that comes as a key fob, or remote transmitter, that you can attach to your key ring. The key fob has buttons that allow you to lock or unlock all of your doors, open the trunk or hatch door, or activate a panic alarm which sounds the vehicle horn on and off. The key fob is powered by a small...