Description Features: Eliminate the noise caused by car audio subwoofers, etc. Improve sound quality to generate better sound effect. Made of high quality plastic, wearable and durable-. Isolate and eliminate noise caused by a ground loop in an audio circuit with this ground loop Isolator-. The isolator- ensures that the shield- ground on each audio cable is isolated from any equipment ground, which could cause audible noise when amplified. Specifications: Material: ABS Size:Approx.6.5x3.5cm/2.55x1.37inch Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Audio Noise Filter