I don't like wearing trackers on my wrist and prefer the waist. This clip keeps the tracker in place well and it has never fallen out. My only complaint is that it doesn't offer enough protection around the sides of the screen and is easily scratched/chipped (I found the Alta HR to be quite brittle). I love how the Fitbit clip covers all sides and has a little protective bumper at the top. If you decide to go with this clip, I highly recommend finding a good screen protector. In terms of step counting, I compared the Alta HR on my belt (with this clip) to my old Fitbit One and the steps were within 1% of each other.
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