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All serious power protection diverts excess energy to earth first. If there is good earth connection then the protector will last longer. E1/45U has an earth detection LED for this reason. SmartBrain entry level filter is a passive technology. Managing to cover a more comprehensive range of shielding to like competitors by “cleaning” a wider range of unwanted frequency noise. The filter works both ways. Stopping noise from robbing equipment performance as well as connected devices’ noise contaminating power.