I bought a fitbit flex.... I used it every day until it broke on the 31th day. I know that happens.. so this isn't to complain about it breaking. We got no response from Fitbit so I have a broken flex. Again not the complaint.
Now to the reason I'm responding. Fitbit counts your steps. It's a pedometer. An expensive one... What I really needed and have now purchased is a Polar Ff7 It tells me if I'm working out in my heart range as well as tell me how many calories I've burned. I think this fits my needs better.
I guess what I'm trying to say is think about what you want it for. I don't walk as much as I work out and the fitbit didn't really calculate that.
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