If you do not turn on continuous monitoring, the battery lasts for three weeks, with it on - four days. I don’t know about the measurement error - I didn’t compare. Show time, notifications come. I'm not an athlete, so I won't say anything about sports measurements. The strap is comfortable. For six months, one scratch appeared on the glass (not very noticeable), but it's his own fault. In general, everything is normal. Four stars for the price.
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