I've been going with gangs for almost 2 years. I work in a mine, and I can say one thing - they do not let dust and moisture through. I take a shower every day with hours, a pool a couple of times a month. They feel like new, the display is all scratched. At work, they measured with 2, 3, 4, gangs, galaxy watch - steps are measured the same way. I have a charge from 2 weeks to a month. They are worth their money. But now it's better to buy 4 bands or wait for the 5th.
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