“What's the difference between this one and the charge 4?”
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This is a superior tracker to the Charge 4, as it allows for more user interface. All Charge models are data recorders and do not do things like track O2 and heart health because their graphic displays are not designed for such sophisticated presentation. Consequently, they cost less and are riddled (charge 4 and 5) with technical glitches. Spend the extra money on a Sense or a Versa.
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