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 Compatible with: for C2; C3; C4 for C5; C6; C8 for C-Triomphe; C-Quatre for XSARA Product size: 6.0 * 3.2 * 1.7cm / 3.3 * 1.5 * 1.7in Materiel: Plastic Package list:1 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.