Conclusion - this is a child's toy, perhaps suitable for ladies pretending to be doing fitness. Or for young gadget lovers. Not good for sports at all. It seems that a normal heart rate monitor will be at least 3 times more expensive. However, like any sports equipment. You still won't find what you need. Manufacturers wind up the number of functions instead of bringing to mind the required minimum. The main problem is that this thing does not work when shaking ! Doesn't measure pulse!
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