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Replacing a Key Fob Many modern cars come with key fobs that allow drivers to open doors, set the alarm, and remotely start the engine. These remotes look like advanced car keys, with buttons, and usually conceal a switchblade or laser-cut key inside. You can purchase an additional key for your car by going to the dealership or an automotive locksmith. However, you might also have other options. Here are a few. Battery The key fob is a device that controls the security system of your car, including remote entry and engine start. Keyless entry became standard