BMW F-Series Smartkey Case - 3 buttons Key caseBMW 3 button Remote Key Case 3 Series 5 Series X3 X5 Z4 Key Blade HU92 after market product Key blade: HU58 It is straight forward to replace the inside of the existing electronics of your remote control to the new key shell. Reprogramming is not necessary! The key shell comes without electronics and transponder. Just let the key blade cut at your local locksmith It is important that you read the accompanying description carefully before you start