Ground Loop Noise Insulator Anti-Interference Noise Attenuator for PC Stereo Description: Remove the hum. Eliminate the hum caused by ground loops when the sound source and (some car speakers/home audio systems) use the same power source to get pure music enjoyment, and the best of it will blossom from there. Pure sound quality. There is no damage to rock music, which provides a better experience and can be used on mono. Easy to use, just plug and play, no batteries required. Small and portable, this gadget does not take up much space and can be easily taken with you. Works with any portable device equipped with 3,5 mm audio jacks, for the car audio system / home stereo set. This product can only eliminate the noise and current noise caused by common power and grounding products, but it cannot eliminate the noise caused by other causes, so you should confirm the noise source yourself. Specifications: Material: ABS Black kolor Size Chart: 75x37x21mm/2.95x1.46x0.83 inch The package includes: 1 piece audio noise filter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.