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When should replace it?
1. Obviously when you feel the conduction performance decreased.
2. When it loses its adhesiveness, the adhesive surface(gel) dries out or is gouged or dirt/grime that cannot be removed.
How long can the gel sheets last?
About 30 times, if you use and maintain them it the right way.
How to maintain them in a right way?
Clean/dry your skin before using; Stick them back to the cardboard after using.