Google Fitbit Air - Your personal health coach, built with Gemini. Designed to sit silently on your wrist, taking it all in without disrupting your flow – or your style. A seamless, micro-adjustable fit that sits comfortably and quietly, so you can wear it through work, workouts, and sleep. Measures Steps taken, calories burned, distance traveled, resting heart rate, target heart rate, respiration rate, blood oxygen, duration of exercise, hours slept and duration of sleep stages.