Features: Brand new and high quality Using a ground loop isolator completely eliminates the hum caused by ground loops when the audio source and speaker share the same power supply in some car speakers/home stereos. The noise isolators work by providing clear speech/music by eliminating the current noise in some car speakers/home stereos. For all portable devices with a 3.5mm jack to your car audio system/home stereo when ground loop problems persist. It can also be used for Bluetooth receivers/Bluetooth hands-free car kits in car audio systems/home stereos. Compact and lightweight, this gadget doesn't take up too much space and can be easily carried around. Ground loop isolators are connected to the car to eliminate noise. When using a ground loop noise isolator, you will enjoy high-quality sound. Specifications: Material: ABS Length: Approx. 59mm/2.32in Note: 1. Please allow 1-2cm error due to manual measurement, make sure you do not mind before you order. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1x Ground Loop Isolator