“when you double click the button a green light turns on what’s that for”
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From the retrieved knowledge fragments, it appears there is no specific mention of the green light resulting from a double-click of the button for your device. However, generally for similar products, LED indicators are used to denote certain modes or statuses, such as activation, pairing, or power-related functions. You may need to consult the user manual of your specific power bank model at BestBuy or check the instructions related to LED indicators for precise details.
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