a Fitbit tracker from Xiaomi.

First, the good stuff.
1. price from 17 (at a local online sale) to 40 USD (from a Singaporean official representative).
2. the design is quite stylish, the straps are interchangeable, so you can pick something flashier than the standard one.
3. battery lasts about 3-4 weeks.
4. functions are exactly what I needed: clock, heart rate monitor (because I was tired of counting manually during workouts), pedometer, sleep control.
You can also synchronize it with the Xsmart Alarm app to enable a smart alarm that wakes you up at the most appropriate time :) I haven't installed it yet; I just wrote it down so I wouldn't forget the name of the program.
5. the watch turns on with a flick of the wrist. That is, usually the display is off, but if you lift your arm to check the time, as we normally do, the display turns on automatically.
6. notifications for incoming calls from the phone come through to the bracelet. Considering that I usually have my phone on silent, it's a very useful thing.
I already posted one screenshot in the flood thread. A few more.
sleep statistics
this is it complaining that I sleep incorrectly (I'll fix it, honest, but later)
step statistics (the amount of gasoline saved is especially touching)
Знание некоторых закономерностей освобождает от изучения многих фактов.
Мечты сбываются рано или поздно, так или иначе.