It doesn't calibration right I got a email said I workout 0h and 0 minutes when I know that I done 1h and half last week. It should let you go in settings when you first start it. I am beginner one day it wanted me to run 35 minutes straight.
I've bought a few this one because the power button rips and I can't get it to power off. I had the replacement insurance, but I kept getting the run around with it. I purchased another one because I love the sound and the workout app.