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Fitbit's new Alta HR activity tracker brings a heart rate monitoring update to the original - The Verge
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Fitbit Ionic review (updated): Buy the Versa instead, unless you really need GPS - CNET
Fitbit Alta review: A solid, albeit slightly old tracker
Eight years of Fitbit news leading up to its planned IPO | MobiHealthNews
The story of Fitbit: How a wooden box was bought by Google for $2.1bn
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Eight years of Fitbit news leading up to its planned IPO | MobiHealthNews