Genuine OEM Harman Kardon amplifier (Part # A2129007108) for 2011 Mercedes-Benz E-Class (W212). Fully functional and tested, pulled from a working vehicle. Pulled out of a E-Class from 2011 E350. Designed for W212 C300 and E350 models from 2010 to 2015 Please verify part numbers for compatibility with your vehicle. Free shipping with a 30-day return policy for peace of mind!