Description: Ground Loop Noise Isolator: Eliminate ground loop interference and buzzing noise between audio source and radio. Give you the clean and clear music. 3.5mm Aux: The noise filter works with any portable device that has a 3.5mm jack including smartphones, PC, laptop, tablets, mp3 player, etc. (not for Mic) Features: Improvement of +/- .03db at 20 - 20000Hz. 1.3dB gain audio transformer. Plug and Play: Plugged the ground loop isolator directly into the AUX port, then connect into the audio source, easy to operate. Application: Suitable for car Aux audio and home stereo system. Specification: Product size: 3.5mm/0.14inch Material: plastic Package Includes: 1 Piece Ground Loop Noise Isolator Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!