I bought two of these, one black and one blue. I loaded them according to the instructions. The black one works great but the blue one keeps turning itself off every few minutes and it looks like the battery is dead. I charged it again but the same result. I returned it. Interestingly, the black one (which works) was $4 cheaper than the blue one. The reason I gave 3 stars was because one of them worked well and the other barely worked. So I averaged the score.
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