There is NO interior (remote/electronics/transponder chip)unit inside.Just cut the key blade,take the internal electron(include immobilizer/transponder chip) from original remote and place them to our key shell,then you are 2 Buttons: Lock/UnlockThis item isn't a remote key and it is just a remote key shell case replacement to protect your immobilizer.Specifications:Compatible with:For 107For 207PEUGEOT 307For 308For 407For 607For 307SProduct size: 6.0 * 3.2 * 1.7cm / 2.4 * 1.3 * 0.7inProduct weight: Approx. 36g / 1.3ozMaterial: PlasticPackage Contents:1 x Key Shell CaseOnly the above package content, other products are not included.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.