Features: brand new and high quality Isolate and eliminate noise caused by a ground loop in an audio circuit with this Ground Loop Isolator. Eliminate the humming noise caused by ground loops when the audio source and (some car speakers/home audio systems) use the same power supply, resulting in clear music enjoyment. There is no damage of rock music, giving you a better experience, and can be used on mono with pure sound quality. Easy to use, just plug and for play, no battery required.Small and portable, this gadget doesn'for t take up much space and is easy to take away. This product can only eliminate noise and current noise caused by common power and common ground products, but cannot eliminate noise caused by other reasons, so you need to confirm the source of the noise yourself. Specifications: Color: Black Size: approx 75x21x37mm/ 2.95x0.83x1.46in Type: Ground Noise Eliminator Connection: RCA Type: Square/ Oval Quantity:1PC Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Pc x RAC Ground Loop Isolator