Electro-Harmonix Hum DebuggerEvery musician battles hum in their signal chain. The Hum Debugger turns it into dead silence, courtesy of a little EHX magic. Not a noise gate, and not a noise suppressor but a real hum extractor. Silence is golden. Specifications True bypass Absolutely eliminates hum from any audio source Tough and compact die cast chassis 7. 5AC 400 power supply included Dimensions in inches: 4. 0 (w) x 4. 75 (l) x 2. 25 (h) Dimensions in mm: 102 (w) x 121 (l) x 89