Fitbit unveils Alta HR the world's slimmest fitness wristband with continuous heart rate as well as two new sleep tracking features 'Sleep Stages and...
{"Image ImageDescription": "NEW YORK,NY - MARCH 1: Fitbit unveils Alta HR, the world's slimmest fitness wristband with continuous heart rate, as well as two new sleep tracking features \"Sleep Stages and Sleep Insights \" at an event hosted by actress and dancer Julianne Hough on March 1, 2017 at SWERVE Fitness in New York. (Photo by Dave Kotinsky/Getty Images for Fitbit)", "Image Copyright": "2017 Getty Images"}