["brand new and high quality\nIt will work with any portable device that has a 3.5mm audio jack on it. (doesn'for t work with MIC) May eliminates ground loop noise between the audio source and radio. Can be used for car or home stereo. 　\nFeatures: Improvement of +/- .03db at 20 - 20000Hz. 1.3dB gain audio for transformers. Eliminates for DC current in the 3.5mm audio cable for path. May loose the noise, gain sound quality. Attention! Please read below before bidding. Please buy only if you accept. Ground loop isolators are considered a for band-aid, as they suppress a problem that was created during installation. The only true way to fix the problem is to find the cause of the noise and eliminate it. Sometimes running the power wire down one side of the car and the RCA cables down the other will fix the problem. Another common cause is from using power wire that is too small for the audio system.\nQuantity:1Pc\nNote:Due to the difference between different monitors, the picture may not reflect  the actual color of the item. Thank you!"]