Specifications: 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 electronics(include immobilizer/transponder chip) from original remote and place them to our key shell, then you are ready! The keyblade needs to be cut at your local dealer or qualified locksmith. Type: Remote Key Shell Material: ABS Quantity: 1Pc Button: 1 Button Compatible with: for Mercedes Benz 1984-2004 Features: Empty Case, Replacement, Car Supplies Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Package Includes: 1 x Remote Key Shell