Fitness trackers are electronic devices designed to monitor and record data related to the user's physical activity, health status and general well-being. They are usually worn as bracelets or smart watches and offer functions such as:

Main functions of fitness trackers:

1. Fitness tracking:

Count steps, record calories burned, and monitor distance traveled.

2. Heart rate monitoring:

Measure heart rate in real time.

3. Sleep tracking:

Analyze sleep patterns, duration, and quality.

4. Measuring blood oxygen levels (SpO2):

Evaluate body oxygenation.

5. Stress monitoring:

Assess stress levels using heart rate variability.

6. Specific activity detection:

Record workouts such as running, swimming, cycling, among others.

7. Smart notifications:

Show calls, messages, and alerts when connected to the smartphone.