?After sales service?Our audio noise filter warranty period is 12 months. If you encounter any problems during your use, you can contact our customer service, They will provide you with solution in time. ?Scope of Application?Professional power filter for most of DC 12V devices. Effectively resolve the noise problem of audio. Widely used in car amplifiers, active subwoofers,computers, players,recording studios, conference room amplifiers,and other equipment. ?Compact and portable?Product size:2.5*1.1*1.6 inch;Working Voltage : AC 115/250V, 50/60Hz;Rated Current : 20A,Plug and play, easy to use, no need for power supply, compact and exquisite, can be carried anywhere. ?Simply installation?Easy to install, just use after correct wiring.Stable performance, high reliability. ?Ground Loop Isolator?When your audio source and speakers use the same power supply, a ground loop will occur, resulting in noise. This product can effectively remove these noises.And with a 3.5mm audio adapter cable, it can be used for more devices and scenarios.