Working Principle: The working principle of this noise isolator is to achieve clear voice and music by eliminating current noise in some car speakers and home audio systems. Widely Compatible: Works with any portable device with 3-pin XLR input and output, for car audio system, home audio, when grounding problems still exist. Easy to Use: Plug and play, no complicated setup required, all you have to do is plug in the ground loop isolator. Portable: and lightweight, does not take up much space and can be easily carried around. Type: Audio Isolator Color: As shown Material: Plastic + Metal Package Contents: 2 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 a little different from the real thing. The measurement allowed error is +/- 1-3 cm.