Features: 1. Eliminate Buzz Noise: When using a Blue receiver the buzz caused by the ground loop is completely eliminated when the audio source and the speaker use the same power supply in some car speakers / home stereo systems. 2. How it works: The noise isolator works by providing clear speech / music by eliminating the current noise in some car speakers / home stereo systems. 3. Compatible models: For any portable device with a 3.5mm audio jack for your car audio system / home stereo when grounding issues persist. It can also be used for Blue receiver / Blue handsfree car kit in car audio system / home stereo. 4. Compact and portable: This compact and lightweight (2.01 * 0.59 * 0.59 IN 0.99 OZ) this gadget does not take up too much space and can be easily taken away. 5. Note: The ground return isolator is connected to the AUX jack in the car to eliminate noise. When using a ground loop noise isolator you will enjoy high quality sound. 6. Ground Loop Noise Isolator for Car Audio Systems / Home Stereo with 3.5mm Audio Cable. Notice: Actual color may be slightly different from the image due to different monitor and light effect Easy to use: 1. The audio noise filter can be used with any portable device with a 3.5mm audio jack. 2. No battery needed just plug in your Mpow and start enjoying the perfect audio. includes: 1 x Audio Noise Filter 1 x Cable "