Feature: Eliminating Buzzing Noise : Completely eliminating the buzzing noise, caused by ground loops which happens when the audio source and the speaker use the same power source in some car speakers / home stereo systems when using the Bluetooth receiver. Working Principle : The working principle of this noise isolator is to achieve a clear speech/music by eliminating the current noise in some car speakers / home stereo systems. Compatible Models : Works with any portable device that has 3.5mm audio jacks, for your Car Audio System/Home Stereo, when grounding issues persist. Also used with a Bluetooth Receiver/Bluetooth Hands-free Car Kit in your Car Audio System/Home Stereo. Compact And Portable : Being so mini and light-weight 2.01*0.59*0.59 IN, this little gadget does not take much space and can be easily taken away. Note: 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. Specifications: Size: approx. 2.01 x 0.59 x 0.59 IN Audio input: 3.5mm audio input Frequency response: 20HZ-20KHZ Audio Interface: 3.5mm Package List: 1 x 3.5mm Noise Filter Isolator 1 x Audio Cable 1 x User Manual