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Fitbit Charge HR review: a heart-rate tracker that's skipped a beat | Wearable technology | The Guardian
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fitbit on X: "Introducing: Fitbit Charge, Charge HR & Surge. 3 new trackers & a whole new world of fitness: http://t.co/mml4ojcn6n http://t.co/me5AG2mPFg" / X
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