Specifications:This item isn& 39;t a remote key, it is just a remote key shell case replacement.There is no interior (remote/electronics/transponder chip)unit inside.Key case only. No electronic internals.A new replacement outer shell/case to replace your worn or broken ones.Type: Remote Key ShellMaterial: ABSQuantity: 1PcButton: 3 ButtonCompatible with: for Mercedes BenzFeatures: Empty Case, Replacement, Car SuppliesSize: 65mm x 36mm x 15mm/2.56" x 1.42" x 0.59" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Remote Key Shell