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When buying surge protectors, you will notice a term called "joule" applied often. This term indicates the heart or life of a surge protector. For example, some PowerSquids have 3240 joules and some have 1000 joules, etc.
Every time a surge comes through the line, some of the surge protector's joules are depleted. Therefore, the higher the joule rating on a product, the more protection you have.