
I have Fitbit Sense. The included silicone strap irritates my skin so I'm looking for other options. Just received them and was wearing black. It's super comfortable. Can't comment on durability yet, but they seem good. I have no idea what they mean by mobile app. So let's skip that. I got a large one for my 7 1/4 wrist because I need it according to their specs, but I find it's a bit large. But I really like it, and hardly anyone but me will notice. Good value for money.

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