I have a Fitbit charge 2 and love it

I got it a couple of weeks ago with my air miles points, it does a lot of stuff (still finding out new things)
and you can sync it to your phone for more tracking of things.
Go to the Fitbit web site, I went there after getting mine to learn how to work it and what it can do

So far I've used it for work outs, steps taken, Heart rate, resting, average and max in a work out.
It tells stairs clime, active time, miles walked (think that's what it is, still learning) calories burned, it has a relax time for 2 or 5 minutes where you breath with it and it senses your breathing pattern and of course tells time and date

Any ways it does even more than I have used it for so far, like food tracking, cycling, with a GPS I think, so it tracks route and tells you your miles per hour average and max and distance and more

HTH

Brigitte