3 Elements for sports Measurement

It’s time, frequency and intensity
Time and frequency can be controlled, but how to control the intensity? In a 4-hours-full-Marathon, the intensity of you and Kipchoge, it must be different.
At this time, HR40 would be very helpful.
HR40 heart rate monitor is there for guiding you to exercise effectively according to your heart rate data. Compared with the conventional arm band measurement, the HR40 has the characteristics of accurate measurement: the ECG measurement which has a higher degree fitness with the skin and effectively reflects whether your exercise is effective in real time.

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A button battery can last over 1200 hours so you can focus on your exercise.
Bluetooth/Ant+
Connecting GPS Cycling computer and most Sport App
It can be used in various sports scenarios such as running, fitness and cycling.