Features:OOTDTY Eliminate the noise caused by car 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 circuit with this ground loop Isolator-.The isolator- ensures that the shield- ground on each cable is isolated from any equipment ground, which could cause audible noise when amplified.Specifications: Material: ABSSize:Approx.6.5x3.5cm/2.55x1.37inchPackage Includes: 1x Noise FilterNote: 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.