This item isn't a remote key and it is just a remote key 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 electronic(include immobilizer/transponder chip) from original remote and place them to our key ,then you are ready! Compatible with: For E81 2004-2006 1 Series For E46 1999-2006 3 Series For E39 E60 E61 1997-2006 5 Series For E63 E64 2004-2006 6 Series For E38 1995-2002 7 Series For E83 2004-2007 X3 For E53 2000-2007 X5 For E36/7 E36/8 1998-2003 Z3 For E85 E86 2003-2007 Z4 Product size: 11.1 * 3.9 * 1.7cm / 4.4 * 1.5 * 0.7in Product weight: . 36g / 1.3oz Material: PP Package Contents: 1 x Key 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.