Description: Remove hum. Eliminate the hum noise caused by ground loops when the audio source and (some car speakers/home audio systems) use the same power supply, so as to achieve clear music enjoyment, and the best will bloom from there. Pure sound quality. There is no damage of rock music, giving you a better experience, and can be used on mono. Easy to use, just plug and play, no battery required. Small and portable, this gadget doesn't take up much space and is easy to take away. Works with any portable device that has 3.5mm audio jacks, for your Car Audio System/Home Stereo. This product can only eliminate noise and current noise caused by common power and common ground products, but cannot eliminate noise caused by other reasons, so you need to confirm the source of the noise yourself. Specification: Material: ABS Color: Black Size Chart: 75x37x21mm/2.95x1.46x0.83inch Package Includes: 1 Piece Audio Noise Filter Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!