Pedometer

Recording steps and distance.

Sleep Monitoring

Recording of heart rate and breathing during sleep and diagnosis of problems according to the product. (e.g. restless sleep, lack of deep sleep, etc.)

Heart Beat Monitor

Integrated heart rate monitor.

Calorimeter

Calculates how many calories you have burned each day.

Oximeter

Measure the amount of oxygen in the blood.

Most activity trackers have a battery capacity of around 100mA.

The size of the battery is not always indicative of its autonomy, as this largely depends on the characteristics of the activity tracker and the functions we have active. For example, an activity tracker with a large color touch screen and 24-hour heart rate monitoring will often require charging even if it has a larger battery than a simpler activity tracker.