Description: Ground Loop Noise Isolator: Eliminate ground loop interference and buzzing noise between sound source and radio. Give you pure and clear music.3.5mm Aux: Noise filter works with any portable device with 3.5mm jack, including smartphones, computers, laptops, tablets, mp3 player, etc. (not for microphone) Features: +/- .03db improvement at 20 - 20000Hz. 1.3db. Plug and connect the ground loop isolator directly to the AUX port, then connect to 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 material Package include: 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 image may not reflect the actual color of the item.3. We wish you a wonderful online shopping experience!