Audio Isolation Transformer - One (1) Black 21 Inch 3.5MM Isolation Transformer with Audio Jack Extension Cable Use - This 3.5mm isolation transformer easily connects into your audio/video system and breaks the ground path through cables between components Durable - The auxiliary isolation transformer is 21 inches in length, eliminates speaker hum caused by ground loops, and supports stereo audio signals High Quality - Start at the component last installed before the ground loop was discovered, and connect the audio isolation transformer at different ends of the audio/video cable until the ground loop is gone Cables 2 Go Brand - Since 1984, C2G has provided connectivity solutions for a variety of markets, including corporate, education, healthcare, home theater, digital signage, hospitality, and more, joining Legrand in 2014