Fitbit's Charge 3 adds a better screen, swim tracking, and smartwatch-style features - The Verge
fitbit charge 3 Smartwatch User Manual - Manuals+
First Look: Fitbit Charge 3 Activity Tracker with SpO2 Sensor & Sleep Disturbance Tracking | DC Rainmaker
Fitbit Charge 3 Review | PCMag
Experiences of Charge 3 with water. - Fitbit Community
Amazon.com: Fitbit Charge 3 SE Fitness Activity Tracker Graphite/White Silicone, One Size (S and L Bands Included),1 Count (Pack of 1) : Sports & Outdoors
Solved: Charge 3 heart rate not accurate - Fitbit Community