My Fitbit Inspire HR fits this strap holder perfectly. There's a tiny latch that you press to release the Fitbit, so I'm pretty sure it's secure. The kit includes a tiny screwdriver that you can use to adjust the size of the strap, meaning you'll get a precise fit. Once that's done, you don't have to worry about sizes anymore. Bands with links that need to be removed for a proper fit never work well in my opinion. Now I would recommend this group. Let's see how it holds up over time.
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