New FitBit Surge with wrist heart-rate detection auto-uploads to Strava - BikeRadar
Fitbit Technology | PurePulse
Amazon.com: Fitbit Charge 6 Bundle - Fitbit Fitness Tracker Health Watch with 2 Screen Protectors, Extra Bands and Cloth - Fit Bit Smart Watches for Women & Men with Heart Rate Monitor,
How Do Fitbit Trackers Monitor Heart Rate? | Fitbit Health Solutions