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. 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 electronic(include immobilizer/transponder chip) from original remote and place them to our key shell,then you are ready.Compatible with:For 1SERIESFor 3 SERIESFor 5 SERIESFor 7 SERIESFor E SeriesFor M3For M5For X5Product size: 6.8 * 3.6 * 1.4cm / 2.7 * 1.4 * 0.6inProduct weight: . 28g / 1.0ozMaterial: PlasticPackage Contents:1 x Key Shell CaseOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.