Completely eliminating the buzzing noise, caused by ground loops which happens when the audio source and the speaker use the same power source in some car speakers / home stereo systems when using the bluetooth receiver. Works with any portable device that has 3.5mm audio jacks, for your car audio system / home stereo, when grounding issues persist. It improves the audio, music, speech quality with ultra simple operation, just plug it and go, no external power or battery required. Ultra compact size, exquisite workmanship and delicate quality, elegant shape, easy to be carried anywhere for multiple use. This isolator can NOT eliminate noise which is not caused by ground loops, such as electromagnetic interference etc.