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My tange had a dead battery when it arrived. Charged it up and when the indicator light turned blue i turned it on and it's had no issues so I think it's safe to let them lay around without using it. It recovers perfectly. I'm just trying to figure out how you got it to recognize my fingerprints 嵐
P. S. Are they still shipping with a lanyard in the gift box? Mine didn't have one. I'm thinking of a few more since it doesn't come on in your pocket like the k1, tubes, and tips I have