A screen protector or thick case can block the heart rate sensor on a tracker

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Sleep staging on a wrist tracker is mostly inferred from movement Optical heart rate on the wrist reads 20 bpm low during heavy lifting Why running watch GPS cuts corners between tall buildings Chest strap vs wrist optical heart rate for intervals Buying a used fitness tracker: account lock and unknown battery health Magnetic charging pins corrode and the tracker stops charging Two trackers on the same wrist report different step counts What IP68 and 5 ATM ratings really protect a tracker from A tracker battery that lasted a week now dies in two days Fitness band vs smartwatch: do you really need a screen on your wrist?