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 electronic(include immobilizer/transponder chip) from original remote and place them to our key shell,then you are ready Compatible with: For 1-Series 2004 to 2006 E81 For 3-Series 1999 to 2006 E46 (most) For 5-Series 1997 to 2006 E39 E60 E61 (some) For 6-Series 2004 to 2006 E63 E64 For 7-Series 1995 to 2002 E38 (some) For X3 2004 to 2009 E83 For X5 2000 to 2006 E53 For Z3 1996 to 2003 E36/7 E36/8 (some) For Z4 2003 to 2007 E85 E86 Product size: 9.1 * 3.7 * 1.4cm / 3.6 * 1.5 * 0.6in Product weight: Approx. 20g / 0.7oz Package list: 2 x Key Shell Case 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.