• Ground loop filter noise isolator eliminates the hiss, buzz and interference caused by ground loops which happens when the audio source and the speaker using the same power source in some car audio / home stereo systems when using the Bluetooth receiver.
• Works with any devices that have 3.5mm jack including smartphones, tablets, mp3 player, speakers.
• This tiny noise filter is super compact, portable and light weight. It is bidirectional without any setup. Super user-friendly, just plug & play. 
• Close to perfect response of +/- .03 dB from 20 to 20,000Hz. Utilizes proprietary audio transformers for a 1.3 dB gain.
• Include aluminum foil shielded 3.5mm audio cable and user manual