Upgrade your Mercedes-Benz audio system with this Harman Becker Kardon Amplifier AMP. Compatible with various models including the W221 S350, S400, S450, S500, S550, S600, S63, and S65 AMG, as well as the W216 CL550, CL600, CL63, and CL65 AMG. This OEM part number 2218701889 . Other compatible part numbers include 2219026902, 2218705389, 2218205789, and more. Made in Germany, this amplifier is designed for front placement on the vehicle.