BESIGN Ground Loop Noise Isolator for Car Audio/Home Stereo System with 3.5mm Audio Cable Besign Ground Loop Noise Isolator for Car Audio / Home Stereo System with 3.5mm Audio Cable Eliminating Humming Noise If you've got your radio, iPod, MP3 player, bluetooth receiver or similar audio equipment plugged into your car stereo with an audio cable and you're getting audio humming noise caused by ground loops, you need this isolator to work together so that you can enjoy high quality music. Forget about the annoying noise! Pure Audio You can enjoy the clean and clear music/audio by eliminating the current noise in some car speakers / home stereo systems when grounding issues persist, also used with the bluetooth receiver,or bluetooth hands-free car kit. Package Contents: 1 x Besign Ground Loop Noise Isolator with 3.5mm Audio Cable 1 x User Manual. Product Features Ground loop filter noise isolator, eliminating the hiss, buzz and interference 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. You can enjoy the clean and clear music/audio by eliminating the current noise in some car speakers / home stereo systems. Works with any device that has a 3.5mm jack including smartphones, tablets, mp3 player, speakers, when grounding issues persist. You could also use with a Bluetooth Receiver/Bluetooth Hands-free Car Kit in your Car Audio System/Home Stereo. Being so mini, portable and light, plug and play, no battery need or button, all you need to do is to plug in the ground loop isolator Portable, light-weight and plug and play without any complicated setup. Package Contents: Besign Ground Loop noise Isolator with 3.5mm Audio Cable, User Manual.