Very well designed and discreet wrist or pocket. But: - Measurement in running-based pedometer and therefore based on the step length in theoretical Running depending on your size. For me there are 20% error, certainly due to the fact that I make (relative) small steps when I run. It's boring ... - The heart rate measurement is performed by placing the finger on an optical sensor, so not continuously. Too bad. Otherwise all OK but it boils down to an improved pedometer. It is better for less ...