noise current sound, protect equipment, built-in transient, surge suppression, anti-static protection circuit, can solve long-distance transmission loss. This is a passive audio signal isolation device that uses a pair of high-performance permalloy nickel steel isolation for complete isolation of input and output signal grounds. Has a very flat and wide frequency response. Widely Compatible: Works with any portable device with 3 pin XLR input and output, for car audio system, 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 , does not take up much space and can be easily taken away. Colour:black Material:Metal Size:102 x 31 x 25mm 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.