Electro Harmonix Humdebugger Hum Eliminator - UsedThis Electro Harmonix Humdebugger Hum Eliminator is in excellent condition and comes with the box and power supply. The Hum Debugger from Electro Harmonix acts as a ground loop hum eliminator, and not as a noise gate or suppressor. It is an ideal solution for the guitarist or bassist plugging into non ideal domestic power. The Hum Debugger uses a proprietary power supply, which is included with the pedal.