Features: 1.Advanced Material: Made of high quality ABS material, the audio noise isolator has a long service life. 2.Current Noise Prevention: Realize clear voice and music by eliminating the current noise in some car speakers and home stereo systems. 3.Buzzing Prevention: The audio noise isolator can eliminate the buzzing caused by ground loops. 4.Portable: This noise isolator is small and lightweight, which does not occupy too much space and can be easily taken away. 5.Universal: It can be used with the bluetooth hands?free car kit and home stereo in the car audio system. Specification: Item Type: Audio Noise Isolator_x000D_ Material: ABS_x000D_ Color: Black_x000D_ Audio Input: Stereo_x000D_ Frequency Response: 20HZ-20KHZ_x000D_ Audio Interface: Approx. 3.5mm / 0.14in_x000D_ Product Application Range: Suitable for Any Portable Device with 3.5mm Audio Interface, Suitable for Your Car Audio System, Home Stereo System and Bluetooth Receiver