So I bought this product I not conaissais and I am delighted. In flat or downhill parts, I leave in the pocket (really very light and lil) and when cà up and I feel that I am worth, I put it and look where I am in my fc. Once or 2 I realized that I had a little too forced (170 at my age is best avoided).
Since I no longer separates me in my rides.
Just one defect: the battery is not easy to change -faut a screwdriver small enough and I have not
For the race on foot, I can not tell you, I run but not for randon, it's really good