This is a Ground Loop audio Isolator, Acoustic Noise Filter, Eliminate audio current sound, former signal noise reducer. 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, 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 RCA 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: Model: R2 input channel 2 output channel 2 Input impedance 600Ω Output impedance 600Ω Installation method plug and play desktop Frequency response 20Hz-20KHz Level Loss ≤ 0.03% @ + 22dBu Insulation resistance DC1000V 100MΩ Isolation voltage AC 50Hz-60Hz/0V-1500V Wiring port RCA Weight 100g Dimensions: 72 x 40 x 25mm LWH Hot swap support hot swap Material: Metal colour: black 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.