The seat occupancy mat is a sensor mounted in the front passenger seat.The emulator simulates a situation of a person sitting in the passenger seat with a seat belt fastened.To make the emulator work you need a diagnostic tool (like for , , etc.) to remove old errors of a broken seat mat that are stored in the control unit. Once you connect the emulator your diagnostic tool will be to remove old errors and turn off the SRS warning. Unfortunately, the errors related to the safety systems are not removing automatically.Before purchase, please scan your car with a diagnostic tool to make sure your SRS warning is caused by a defective seat mat.for CClass W203 SaloonSedan (20002004) before faceliftfor CClass S203 Estate (20002003) before faceliftfor CClass CL203 Sport Coupe (20002008)for CL203 (20082011)for CLK W209C209 Coupe (20022004) before faceliftfor CLK W209A209 Cabriolet (20022004) before faceliftMaterial:Plastic + Metalcolour:As shownPackage Contents:1 * Bypass emulatorOnly 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 +13cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.