LEAKED: Fitbit's New Fitness Tracker Comes With A Larger Screen And Can Measure Your Heart Rate
Fitbit Inspire 2 Health & Fitness Tracker with One 1 Year Trial Version Fitbit Premium, Continuous Heart Rate Monitor & Up to 10 Days Battery Life & Unisex Adult Clip Inspire 2 :
6 Ways Continuous Heart Rate Tracking Gets You Closer to Your Goals
How to measure heart rate on your smartwatch - The Verge