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Replacing a Key Fob Many modern vehicles come with key fobs that permit drivers to open doors, set the alarm remotely and start the engine. These remote devices are similar to modern car keys, but they have buttons and often cover a laser-cut switchblade or laser key. You can obtain an additional key for your car by going to the dealership or an automotive locksmith. But, you might also have other options. Here are a few. Battery The key fob is used to control the security systems of