New 3 Buttons Remote Key Shell Case for MERCEDES-BENZ SMART Fortwo Roadster Forfour Crossblade City Cabrio No Chips Inside Key blade size:35mm*8mm It can be used for several different years and models and you can check with your local dealer to verify it's compatibility with your vehicle Please be sure you have a factory keyless entry system and be certain that this is the proper key for your vehicle If you have a worn & broken Key Blank /Remote Case, all you need to do is remove the internal component from your old remote and put it in this case,then the uncut keyblade will have to a locksmith or a dealer to be cut to match your car This is just a Key Cover shell, there is NO interior (remote/electronics/transponder chips) inside.