By reading the product description, I expected a miracle product! In fact, it is a basic heart rate monitor. Ah !!! No worries about my heart rate! This is the essence of what is expected of such a product, of course, but in terms of speed or distance ... The setting is laborious. After 5 calibrations, I'm about the procedure by heart, I still can not have correct measurements. About distances, I'm getting a little more fine tuning. The observed error after correction is still 150m / km on average. So I do not get to have a correct measurement over 85%. In terms of speed, it's the same. I love these great moments of solitude or in full sprint, the watch tells me I over 9km / h or, in the stretch, I'm more than 23km / h! Seriously, the system is not developed to that level. If you want to monitor your heart activity, this product for you. If you want to use the other functions ... I keep this watch because it is very readable and easy to use (in whole). I wear it every day. It is discreet and allows me to work my heart strength without buying hardware that stagnate at the bottom of a closet.
