Buying my father a fitbit for fathers day Hi guys.

I was pointed out that my Dad (who's trying to lose weight, mostly through very gentle walking exercise and eating healthy) could benefit from a Fitbit.

I've never used a fitbit, but i'm aware there are different types. Is there a fitbit that's better for weightloss help than actual exercise/gym work?

I have a budget of around £100 if that helps.

Thanks a lot :)