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 electroni(include immobilizer/transponder chip) from original remote and place to key shell,then you are Compatible with:for C2; C3; C4for C5; ; C8for C-Triomphe; C-Quatrefor XSARA Product size: 6.0 * 3.2 * 1.7cm / 3.3 * 1.5 * 1.7inMateriel: PlasticPackage list:1 x Key Shell CaseNote: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.