Set a goal and go. Stay focused on your goals and get motivated to be more active with Flexâ??a slim, stylish device that tracks all-day activity like steps taken, distance traveled, calories burned and active minutes. See your day in a whole new light. Flex lets you see how every day is stacking up with LEDs that light up like a scoreboard as you get 20% closer to completing your step, calorie or distance goal. Fitbit Flex automatically tracks how long and how well you sleepâ??no tapping necessaryâ??so you can monitor your sleep trends without interrupting your nighttime routine. It also includes a silent, vibrating alarm to make your wake-up call more peaceful.