Features: 1Advanced Material: Made of high quality ABS material, the audio noise isolator has a long service life. 2Current Noise Prevention: Realize clear voice and music by eliminating the current noise in some car speakers and home stereo systems. 3Buzzing Prevention: The audio noise isolator can eliminate the buzzing caused by ground loops. 4Portable: This noise isolator is small and lightweight, which does not occupy too much space and can be easily taken away. 5Universal: It can be used with the bluetooth hands?free car kit and home stereo in the car audio system. Item Type: Audio Noise Isolator Material: ABS Color: Black Audio Input: Stereo Frequency Response: 20HZ-20KHZ Audio Interface: Approx. 3.5mm / 0.14in 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 1 x Audio&nbspNoise&nbspIsolator 1 x Cable 1 x Manual