Features:ELIMINATING NOISE:Completely eliminating the buzzing noise caused by ground loops which happens when the audio source and the speaker use the power source.WORKING PRINCIPLE:The working principle of it 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, suitable for Car Audio System / Home Stereo. Also used with a BT Receiver in car audio system.COMPACT & PORTABLE:Being so mini and light-weight (2.01*0.59*0.59 IN, 0.99 OZ), this little gadget does not take much space and can be easily taken away.ENJOY CRYSTAL SOUND:The Ground Loop Isolator connect to the AUX Jack in car to eliminate noise. You will enjoy good quality sound when use it.