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Fitbit Charge 4 updated with features like skin temperature, SpO2 tracker, and more- Technology News, Firstpost
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Fitbit Charge 4 update shows SpO2 data on the band itself, tracks skin temperature - GSMArena.com news
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Fitbit unveils Charge 3, adds SpO2 tracking in preparation for potential sleep apnea, a-fib features | MobiHealthNews
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