Based on your preset information memorized by the watch, your heart rate , and the time on the counter, the calorie watch is able to determine how many calories you have burned during your workout
The watch could read your heart rate when you put one of your finger on "sensor" button
The calorie watch also tells you which of your 5 Activity zones you exercised in
1.Time and calendar
2.daily alarm and hourly chime
3.Chronograph (stopwatch) with split lap time
4.Exercise counter with automatic and manual override calorie counter
5.External pulse mode for determining heart rate at any time