Lost or damaged your Ford Fusion key fob? This is a perfect replacement set. You get TWO fully assembled smart key fobs that are compatible with the Ford Fusion from 2017 through 2021. They match the FCC ID M3N-A2C93142600 / M3N-A2C931426 and part numbers like 164-R8149, 164-R8162, 164-R8244, and 164-R8278. Each fob has 5 buttons and the proximity smart key function, so you can lock/unlock and start your car just like the original. They come with batteries installed and are pre-tested. SUPER IMPORTANT: These are blank fobs and MUST be professionally programmed by an automotive locksmith to work with your specific car. Most car dealers won't program aftermarket fobs, so a locksmith is your best bet. Always double-check the FCC ID and part number on your old fob before buying. Having a spare (or two!) gives you major peace of mind. A great, cost-effective solution instead of going to the dealership.