Specifications:Perfect to replace your damaged and old one.Key case, no key blade. Not electronic internals.Take the internal electronics(include immobilizer/transponder chip) from original remote and place them to our key shell, then you are ready.Fitment:For Mercedes Benz B C E S ML SLK CLK ClassItem Name: Key Shell CaseMaterial: ABSButtons: 2 ButtonTransponder Chip: NoElectronics/Battery: NoNotes:This item isn& 39;t a remote, it is just a remote key shell case replacement.There is NO interior (remote/electronics/transponder chip)unit inside.Please compare with pictures before purchase, make sure your key is exactly as same as picture shows.Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Package Includes:1 x Key Shell Case