With interface design of Isolator,can effectively protect the circuit. Eliminating Buzzing Noise caused by ground loops in some car speakers / home stereo systems. Works with any portable device that has 3.5 mm audio jacks, for your Car Audio System/Home Stereo. The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise.You will enjoy good quality sound when use it with Ground Loop Noise isolator. Easy to Use, Just plug and play, no battery needed. Copper spacer layer, the effective interference, improve sound quality. Package: 1pcs Ground Loop Noise Isolator with Cable Item Specifications: Type:Ground Loop Noise Isolator Audio Interface:3.5mm Frequency response:20HZ-10KHZ Audio input:Stereo Colour:Black