The best value for my money, I conduct business with them in the pool, and they are aware of the discipline I compete in. They take highly precise readings when determining the amount of oxygen that is present in the blood (I tested it against a pulse oximeter when I was sick with covid and found that the findings were similar). To sum it up, the best value for your money! Got pros: A inexpensive bracelet that tracks your sleep, is waterproof, and comes with a variety of workout routines Various disadvantages: It's possible that the clasp that holds the strap to the bracelet isn't the most secure.
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