Working Principle: The working principle of this noise isolator is to achieve clear voice and music by eliminating the current noise in some car speakers and home audio . Widely Compatible: Works with any portable device with 3 pin XLR input and output, for car , home audio, when grounding issues remain. Easy to Use: Plug and Play, no complicated setup required, all you need to do is plug in the ground loop isolator. Portable: Small and lightweight, does not take up much space and can be taken . type: audio isolator color:Black Material:metal+plastic Package Contents: 1 x audio isolator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.