Brand NEW! Ground loops create noticeable hum in home audio systems, and alternator whine (also known as engine noise) in car audio systems. Eliminate both with the BOSS B25N ground loop isolator. Key Features Cancels irritating ground loops Eliminate system hum in home audio systems Remove alternator whine in car audio systems The BOSS B25N is designed to eliminate ground loop noise (usually referred to as hum) and alternator whine from two RCA line-level audio channels. Great for the car, and even for the home, where amplifiers and other electronics (such as crossovers and equalizers) are separate of the source. Built-on mounting tabs facilitate installation. Dimensions (L x W x H): 3.4" x 1.5" x 1.5". - All international buyers are responsible for all tax, duties and/or customs fees.