Audio Isolator Anti-Interference Noise Reducer Eliminate Bluetooth Receiver 1. Eliminate hum: completely eliminate the hum caused by the ground loop,when the audio source and the speaker in some car speakershome stereo systems using Bluetooth receivers use the same power supply, a ground loop will occur 2. Working principle: the working principle of this noise isolator is to achieve clear voicemusic by eliminating the current noise in some car speakershome stereo systems 3. Compatible models: when the grounding problem still exists, it is suitable for any portable device with a 3.5mm audio jack (for your car audio systemhome stereo), and can also be received with bluetooth in the car audio systemhome stereo to use with bluetooth hands-free car kit 4. Small and light, this small tool takes up little space and can be taken away easily 5. Easy to use, this Mpow can be used with any portable device with 3.5mm audio jack 6. No battery required, just plug in Mpow and start enjoying perfect audio 7. Size: 5.1x1.4x1.4 cm 8. Weight: 28 grams