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 to remove old errors of a broken seat mat that are stored in the control unit. Once you connect the emulator, use your diagnostic tool to remove old errors and turn off the SRS warning. Unfortunately, the errors related to the safety systems are not removed automatically. Before purchase, please scan your car with a diagnostic tool to make sure your SRS warning is caused by a defective seat mat. Name: Car Seat Occupancy Mat Sensor SRS Bypass Emulator Fitment Type: Direct Replacement Install Fitment: for CLK W209 2006-2009 for MB CLK W209 2006-2009 C W203 2005-2007 Note: Installation guide not included; professional installation is strongly recommended. Please verify compatibility and compare the part number with your existing unit before purchasing. Color: As shown in photo Material: Plastic Package Contents: 1 x Car Seat Bypass Emulator Sensor Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.