Twenty years ago our family house in VT was struck by lightning because the lightning rods hadn't been properly maintained. Lightning traveled across the wooden floor from the telephone wires towards my uncle, who was seated at a table 10 feet away; happily, it didn't reach him. Most electrical appliances were destroyed. But the burglar alarm, protected by a ZeroSurge (same technology as the Surge X), wasn't damaged. The alarm panel has since been upgraded, but the ZeroSurge is still in service. I think of such protection the same way I think of buying the best tires I can find: If it's needed once, it's paid for itself!
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