Ecusells Folding Flip Key Case for BMW 3 5 7 SERIES Z3 Z4 E38 E39 E46 Remote Case Fob 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 electroni(include immobilizer/transponder chip) from original remote and place them to our key shell,then you are ready!