The product is a Harman Kardon audio sound amp amplifier for a BMW 328I GT XDRIVE F34 model. It is a digital input amplifier with the manufacturer part numbers 9 393 186 and 9393186. The amplifier comes with a 1-month manufacturer warranty and has superseded part numbers 65129390140, 6512 9390140, and 6512 9 390 140. Made in Hungary, this OEM part is designed for specific BMW models and does not offer universal fitment.