Mercede W221 S550 S350 S400 CL600 CL550. Tire Pressure Monitor Sensor 433.92 MHz. Set of 4 0035400217 OEM. PLEASE MAKE SURE TO MATCH THE PART NUMBER WITH YOUR ORIGINAL PART. WHAT YOU SEE IN THE PHOTOS IS WHAT YOU WILL RECEIVE. All electronics are tested before removed from vehicle. If not functional, we will NOT sell. Please ask questions before purchasing. All the parts are tested either before or after removal from the vehicle. Before purchasing the item, the customer MUST verify that the item will fit the said vehicle. Item may show light scuffs, scratches or other imperfections as a result of this being a used part. Once you have received your item in satisfactory condition, please leave us feedback.