The Humno gets rid of Ground Loop Hum at the Source! Just plug it into the power input of your amplifier or other audio device and say goodbye to that pesky Hum. The Humno prevents the causes of Hum and Buzz from reaching your Audio Equipment so your sound remains crystal clear. It works anywhere in the world and easily connects to your Audio Equipment's power cable input. Works up to 8 Amps and has LED indication.