I don't even use 3/4 functions. Well, there is and is, it will certainly come in handy for someone, especially those who lead an active lifestyle. I can not put a third-party dial in any way. This is from my stupidity, probably, but still . The battery with bluetooth turned on and several functions is easily enough for a week. Purely like a clock did not try. I liked the water protection, I love fishing, which is why I drowned a good watch 2 times. I hope nothing happens to these. I compared the oxygen meter to the topic with the usual one, on the finger of which, the readings sometimes differ by a maximum of 1%. Not sure how long they will last but so far very happy with the purchase. Added after 10 months; All contentment with the purchase is gone, because at such a pace in a year and a half the watch will turn into a useless piece of metal-electronics. I absolutely do not recommend buying.
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