Use only on equipment with current draw of 6 amps (720 watts) or less Not a ground lift - maintains equipment ground Suitable for use on 120V 60Hz grounded USA-style power outlets Use 1 Hum X per piece of gear. Multiple hum issues may require more than one Hum X. Not designed to get rid of cable related or guitar pickup related hum. NOTE: Check Instructional Video and User Manual before use Filters noise and excess current on ground line that can cause hum and buzz in audio or video. Use only on equipment with current draw less than 6 amps (720 watts)