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Exterminate ground hum at the source! filters unwanted low voltage from ground line that cause ground hum while maintaining ground connection. Simply plug hum x into the offending outlet and plug your equipment into hum x. That's it! max current draw 6 amps (720 watts). Led indicator. Note: hum is caused for many different reasons, the hum x is designed specifically for ground loop related hum problems. For other types of hum issues, you may need our hum eliminator. Hum x works only on three prong power cords and outlets. Not sure if hum x is solution to your hum problem?