The locking mechanism has the underside of the strap against the skin which rests against my wrist and irritates the skin. I don't know if plastic is just a cheap material, but it didn't take long to cause sores. The group that came with my Fitbit didn't do it AT ALL. Yes, I cleaned it according to the instructions. They sent me a new one, the same. Can't be used if I don't need sides and belts right away. I am sorry.
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