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Thank you for your question. Here's how you can tell if it's no longer working. LED Indicator Light, If the LED is on, the surge protection is active and functioning. If the LED is off, it likely means the surge protection has failed, and the unit should be replaced
Sorry, there was a problem. Please try again later.There is a little green LED on one end (next to where the cord enters) that is supposed to indicate functionality. Presumably, upon failure, it would either change color (red?) or just go out.
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