brand new and high quality Feature: Eliminating Buzzing Noise caused by ground loops in some car speakers / home stereo systems. No external power supply, this noise isolator can achieve a clear speech/music by eliminating the current noise in some car speakers / home stereo systems. Works with any portable device that has 3.5mm audio jacks, for your Car Audio System/Home Stereo. Compact and lightweight, it will not take much space and can be easily taken away. Specifications: Item type: Ground Loop Noise Isolator Audio Interface: 3.5mm Frequency response: 20HZ-20KHZ Audio input: stereo Size: 59X20X18mm Note: 1-3mm error might exist due to manual measurements, please kindly understand. The colors deviation might differ due to different monitor settings. We provide you with the best product and service, if you have any problem, please let us know, and we will solve the problem ASAP. Thank you so much. Package includes: 1 x Ground Loop Noise Isolator 1 x Audio Cable