Features 1.Common 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. 2.Eliminate 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. 3.Plug 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. 4.Noise 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. 5.Pure Sound Quality: The car sound ground loop noise isolator has no rock damage, giving you a better experience and can be used on mono. specificationItem Type: Ground Loop Noise Isolator_x000D_ Material: ABS_x000D_ Interface: 3.5mm_x000D_ Applicable Field: Noise Reducer PackageList 1 xGround Loop Noise Isolator 1 x Manual NoteCan not eliminate the problem of murmur :_x000D_ 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._x000D_ Since everyone's expectations of the isolation effect are different, different senses, some customers feel good, some customers feel bad.