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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. C2 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.