Fangrui Product Details Description: This Is A Ground Loop Audio Isolator, Acoustic Noise Filter, Audio Current Sound, Transformer Signal Noise Reducer. Remove . The Noise Caused By Ground Loops When The Audio Source And (some Car Speakers/home Audio Systems) Use The Same Power Supply, So As To Achieve Clear Music Enjoyment, And The Bloom From There. Quality. There Is No Damage Of Rock Music, A Better Experience, And Can Be Used On Mono. Easy To Use, Just Plug And Play, No Battery Required. Small And Portable, This Gadget Doesnt Take Up Much Space And Is Easy To Take Away. Works With Any Portable Device That Has Audio Jacks, For Your Car Audio System/home Stereo. This Product Can Only Noise And Current Noise Caused By Common Power And Common Ground Products, But Cannot Noise Caused By Other Reasons, So You Need To Confirm Of The Noise Yourself. Specification: Model: R2 Input Channel: 2 Output Channel: 2 Input Impedance: 600 Output Impedance: 600 Installation Method: Plug And Play Desktop Frequency Response: 20hz-20kh