Boxed Edition 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. LED indicator and two-year warranty. Features include: Eliminate Ground Loop at the source Filters unwanted currents and voltages in the Ground line while maintaining safe ground Simply place on end of power plug and plug Hum X into wall outlet LED shows that Hum X is working Suitable for 120 Volt North American Type A or B outlets only Maximum recommended current draw 6 Amps