They perform their function of collecting data. They are not 100% accurate, but they see the averages, and most often they either coincide or are very very close to the numbers on the tonometer. And besides, it's still a watch, with a heart rate monitor, relaxation index and other functions. For 12-13t. R - of course I would like more (for example, a full-fledged OS, like analogues for the same money). But this device is specifically for collecting health data, you should not consider them as a smart watch - you will be disappointed. Someone else wrote - about a terrible display (they say it's ugly, not of high quality). The display is similar, and most likely it is like a simple reader (electronic book) can be seen normally. Of course, these watches were not created in order to watch films on them. Indeed, due to such a display, they can work without recharging for 1.5 or even 2.5 weeks.
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