0+ hours of activity, exercise & sleep tested
Over 0 prototype iterations since 2010
A series of iterations.
The technology inside PurePulse was inspired by hospitals—which clipped a thimble-sized sensor onto the finger and used a technique, called photoplethysmography, to measure heart rate.
For that technique to track heart rate on the wrist, during workouts and in various environments required an extraordinary amount of research and refining.