I have never used smart watches/bracelets. What can you advise?

Question

Mobile devices

I have long wanted to buy a smart watch or a fitness bracelet. Of course, I will still look on the Internet, I will conduct my own research. But what can you advise from your experience? Basic requirements:
- to show the time
- so that you can see the time without pressing buttons (screen activation by hand gesture)
- to notify you about calls, sms, including notifications from third-party applications - telegram, whatsapp, ...
- smart alarm clock taking into account sleep phases
- so that everything can (if necessary) work without the Internet and without a smartphone
- compatibility with the iPhone
- as much battery autonomy
as possible - as low a cost as possible (we exclude an apple watch for $ 400), but taking into account the above requirements