- Detection of atrial fibrillation
- Heart rate measurement accurate
- No ECG
- Not wirelessly chargeable
- Data protection only okay
The Fitbit Air is a sleek and lightweight fitness tracker that fits snugly even on slender wrists, making it barely noticeable when worn. Another advantage is its long battery life – it lasted more than a week on a single charge in our tests. While it offers fewer features in the sports sector than models from Polar or Whoop, it impresses with good automatic workout detection...




