The device is specifically designed to eliminate ground-related Hum and Buzz issues quickly and easily. Features: It filters low voltage from the ground line that causes audio ground loop hum and buzz. Plug-in design, small and lightweight, easy to use. Suitable for 120V 60Hz grounded US power outlets. Does not affect voltage in any way, neither the sound quality of audio equipment. A built-in LED indicator shows that the device is working. Can be used on equipment with up to but no more than 6 amps current. Note: The No-Hum is not designed to solve cable or pickup related noise. Specifications: Material: ABS Color: Black Plug: US plug Item Size: 8*4.4*3.2cm / 3.14 * 1.73 * 1.25in Item Weight: 180g / 6.34oz Package Weight: 230g / 8.11oz Package Size: 9*8.2*5.7cm / 3.54 * 3.22 * 2.24in Packing List: 1 * Buzz eliminator