I ordered through -market with a discount of 2 thousand. Most likely a display sample came with an opened package and a discharged battery. There were no signs of wear, did not return. Because of this, the first 3-4 charges, the battery swayed and adapted (the percentage of charge was displayed crookedly). Then the adaptation passed and everything became normal. I don't use AOD. Heart rate monitoring every 5 minutes. Enhanced sleep analysis included (with REM phase recognition). In this mode now lives for about 5 days. Although it happened and much more - I did not understand what is connected with. GPS works, but the accuracy is not perfect, as noted in the reviews. Those. the line of motion is not straight, but zigzag. For me it's not critical. In fact, this is the same fitness bracelet, but it looks much better on the arm. In addition, the readings are also significantly superior to bracelets in terms of readability.
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