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 to key shell,then you are . Compatible with: For 1SERIES For 3 SERIES For 5 SERIES For 7 SERIES For E Series For For For X5 Product size: 6.8 * 3.6 * 1.4cm / 2.7 * 1.4 * 0.6in Product weight: . 28g / 1.0oz Material: Plastic Package Contents: 1 x Key Shell Case Only the above package content, other products 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.