1. Noise reduction: This product can completely eliminate buzzing or humming noise caused by ground loops which happens when audio source and speaker use same power source in some car speakers or home stereo systems. 2. quality: This product does not cause damage to sound quality of music, can give you a better listening experience, and can be used on mono. 3. Wide range of applications: This product is suitable for any portable device with 3.5mm audio jack. It can input and output stereo audio through 3.5mm / AUX, and can also be used for amplifiers. 4. Plug and play: This product is simple and convenient to use, no battery is required, you only need to insert ground loop isolator. 5. Small and portable: This product is very compact, light weight, does not take up too much space, and is easy to carry around. s: 1. This product is an audio common ground isolator, which can effectively eliminate noise caused by common source and receiving equipment. 2. This product is suitable for current sound elimination of car Bluetooth, Bluetooth transmitter and Bluetooth receiver. Model: G1 Type: riser card Interface: audio output Colour: black Material: ABS Size: 15cm Package Contents: 1 x system Only above package content, other products are not included. Note: Light and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.