Swimming in the pool is very inaccurate. Since the watch measurements are 350 yards versus 500 yards, all swim measurements are garbage and don't count. The only reason I bought it. I watched it, not counting the first two segments. And then lengths 7, 8, and 9. After that I stopped looking at him. Complete garbage. The rest of the "except water" applications appear to be correct and match the secondary spo2. Although it doesn't matter. Do not offer a watch as a swim watch if it does not work. Update: 8-11-21 Only swam breaststroke and they could tell which stroke I was swimming. Changed the wrist it was on when it was a dominant, non-dominant issue. He counted even fewer laps I swam. From 500 yards they counted 300. In fact, there is no compensation for their indoor swimming mistake. It is too expensive for a comparable watch with these features and without a swimming function. But that's what it's effective for. There is no feedback from the manufacturer to fix the problem or replace a new watch. updated 8-17. Time-lapse video Garbage Watch cs201
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