What is the difference between MI Band 3 and MI band 4?

Related questions

1. What is NFC in MI band?
2. Can I track my MI Band 3?
3. What is Xiaomi Mi Band 3?
4. Can Mi Band 3 receive calls?
5. Is xiaomi Band 3 good?
6. What is the difference between honor band 3 and 4?
7. Does Mi band automatically track sleep?
8. What can we do with MI Band 3?
9. Does Mi Band 3 have fingerprint sensor?
10. Is MI Band 3 Sleep Tracker accurate?

Tags

1. #between
2. #400nits
3. #amoled
4. #about
5. #inches
6. #resolution
7. #comes
8. #curved
9. #difference
10. #provide
11. #contrast
12. #brightness
13. #panel
14. #primary
15. #display