A bracelet was presented to me. I should start out by saying that it is almost completely unfit for sporting events. I gave them a try at the standard swimming pool length of 50 meters. I didn't even bother to count the actual strokes! Definitions are something that Kroll avoids. I used them for a run, and the heart rate tracking was comparable to that of a chest monitor. It's an awfully long way. My gps said I ran 5.2 kilometers, while the wristband said I ran 6.1 kilometers. In conclusion, the bracelet functions well as a lightweight notification watch but is unsuitable for physical activity.
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