I purchased the smartwatch Xiaomi Mi Band 4, so I’ll share my personal review.
 
Good Things About Xiaomi Mi Band 4
  - Vibration alarm function ⏲
- Sedentary reminder 📺
- Outdoor running 🏃
- Rich variety of third-party replacement bands ⌚️
- Used it for about 2.5 years 👍
Bad Things About Xiaomi Mi Band 4
  - Couldn't charge after about 2.5 years 😞
That’s all from the Gemba.