JacobsParts 3.5mm Aux Audio Noise Filter Ground Loop Isolator Eliminate Car Electrical Noise

Eliminate ground loop humming and buzzing noise between an audio source and an amplifier. This device can go between any device with a 3.5mm audio jack such as a cell phone or MP3 player, and an amplifier such as the AUX input in a car or on a home stereo. If you hear noise when charging your device but not when operating on battery, then this product should solve the problem.