? Features: This item isn't a remote key and it is just a remote key shell case replacement. Key case and uncut key blade only. Not electronic internals. Best replacement for a key with broken buttons or worn key case. There is NO interior (remote/electronics/transponder chip)unit inside. Just cut the key blade，take the internal electroni(include immobilizer/transponder chip) from original remote and place them to our key shell，then you are ready! There's no programming needed. Specifications: Compatible with: for Smart Fortwo                  for Smart K                     for Smart Roadster                  for Smart City Coupe                  for Smart City Cabrio                  for Smart Forfour                  for Smart Crossblade Product size: 9.0 * 4.8 * 1.6cm / 3.5 * 1.9 * 0.6in Product weight: Approx. 20g / 0.7oz Package size: 9.0 * 4.8 * 1.6cm / 3.5 * 1.9 * 0.6in Package weight: Approx. 21g / 0.7oz Note: Please check your key whether it look the same as the one in our product picture above. Package list: 1 * Key Shell Case