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Fitbit Charge 4 with built-in GPS, NFC, Spotify is available for pre-order
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Fitbit Charge 4 review: No contest - Android Authority
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Amazon.com: Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep & Swim Tracking, Black/Black, One Size (S &L Bands Included) : Sports & Outdoors
Fitbit's Charge 4 band can now display blood oxygen saturation levels
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