The occupancy mat is a sensor mounted in the front passenger .The emulator simulates a situation of a person sitting in the passenger with a belt fastened.To make the emulator work you need a diagnostic tool (like , , etc.) to remove old errors of a broken mat are stored in the control unit. Once you the emulator your diagnostic tool will be able 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 your SRS/ warning is caused by a defective mat.These warnings can be turned on by at least 6 sensors mounted in the . The emulator solves the problem caused by a faulty mat only. The emulator will not solve your problem if a different sensor is faulty - the SRS/ warning light will still be after connecting the emulator and removing the error in the diagnostic tool.for E-Class W211 Saloon/Sedan (production years: 2004-2009)for E-Class S211 Estate (production years: 2004-2010)for CLS C219 (production years: 2004-2010)for S-Class W221 (production years: 2005-2013)for /S-Class Coupe C216 (production years: 2006-2014) Colour:As shownMaterial:plasticPackage Contents:1 x Bypass EmulatorOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.