Accurate and easy to use 1 1

Essential for workouts "split" in running, provided you use Runtastic, obviously. Finally, we can quantify and compare than once on the other heart rate. Its maximum speed can be found in competition without grilling from the start.

This accessory is perfectly compatible with the iPhone 6.

The belt slips easily; For the legs, it goes faster. She holds herself by clamping. I put in the washing machine. The sensor unclipped and washes hand. There are no off button. It is the fact of the sensor clipped to 2 buttons pressures belt that turns it on. Be careful to think unclip after use to avoid having to change the CR2032 battery too often.

On the software side (Runtastic Pro), you can set the heart rate zones (Zone 1, Zone 2, ... Zone 5), and the coach warns when changing frequency range during a race. Nevertheless, I did not find an explanation for how to set thresholds. The graphics are shown at the end of the race, but is very clear.