Fitbit's new fitness tracker, the Alta HR, is getting a feature that can monitor deep and light sleep, along with the Charge 2 and Blaze.

Yes, we know we should move more, sleep better, eat right. This amazingly thin, stylish band smoothly and reliably tracks your steps, calories, and sleep. Above all, the Alta HR is the slimmest ...

Fitbit has just introduced the Alta HR, the company's slimmest activity tracker with a heart rate monitor.