Item Type: Ground Loop Noise Isolator Material: ABS Interface: 3.5mm Applicable Field: Noise Reducer 1Common Ground: Common ground means that the grounding points of the two electrical appliances are not at the same point. Due to the difference in grounding resistance, noise is transmitted into the electrical equipment through the ground wire, causing interference and common ground noise. 2Eliminate Buzzing Noise: Noise isolator eliminates hum noise caused by ground loops when the sound source and (some car speakers, home sound systems) use the same power source to enjoy clear music. 3Plug and Play: The ground loop noise isolator is easy to use, just plug and play, no batteries required, small and portable, this gadget doesn't take up much space and is easy to take away. 4Noise Reduction: The 3.5mm loop noise isolator can only eliminate noise and current noise caused by products with common power and ground, but cannot eliminate noise caused by other reasons, so you need to confirm the source of the noise yourself. 5Pure Sound Quality: The car sound ground loop noise isolator has no rock damage, giving you a better experience and can be used on mono. 1 xGround Loop Noise Isolator 1 x Manual Can not eliminate the problem of murmur : non ground caused by the noise, this section is unable to filter, such as electromagnetic interference, etc., be sure to confirm the source of noise yourself before purchase. Since everyone's expectations of the isolation effect are different, different senses, some customers feel good, some customers feel bad.