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Amazon.com: Fitbit Versa 4 Fitness Smartwatch with Daily Readiness, GPS, 24/7 Heart Rate, 40+ Exercise Modes, Sleep Tracking and more, Waterfall Blue/Platinum, One Size (S & L Bands Included)
6 Ways Continuous Heart Rate Tracking Gets You Closer to Your Goals
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Fitbit Charge 4 Fitness Activity Tracker, GPS + Heart Rate Sleep & Swim Tracking | eBay
ER docs get heart rate info from Fitbit, save patient's life | Ars Technica
