Stay focused on your goals and get motivated to be more active with Flex—a slim, stylish device that tracks all-day activity like steps taken, distance traveled, calories burned and active minutes. Auto sleep – Fitbit Flex automatically tracks how long and how well you sleep—no tapping necessary—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. Wear With you all the time – Flex fits comfortably around your wrist, is water-resistant, and has a 5-day battery life*, so you can wear it day to night. And with a variety of available accessory bands, you’ll find the right Flex for every occasion.