Motivation is your best accessory with Fitbit Alta; ; a customisable fitness tracker designed to fit your personal style. Stay motivated by tracking all-day activity ; steps, distance, calories burned and active minutes ; and get credit for workouts with SmartTrack automatic exercise recognition. At night, track your sleep and set a silent alarm to get your best rest. To download your size guide, simply open and save the PDF to your PC and follow the instructions on the document; See stats and time with a bright oled tap display. Display information LED screen. Battery Typical usage time of up to 5 days. 2 hour charge. Physical specification Size: large. Features Pedometer. Distance. Calories. Sleep.