It sucks...or it doesn't! That's the problem. Problem with the inner O-ring. He made some money by running his fingernail over it, but it's still leaking. I have an older model that I bought in 2015 and it worked fine until the battery died. I cleaned the charging contacts, charging was still going on, but then the charging station failed. It's definitely the best wearable device out there if you're lucky enough to get one that works.
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