Fitbit Flex Wireless Activity and Sleep Tracker Wristband: Slim, stylish and always by your side. Track your activity throughout the day and monitor the quality of your sleep at night. LED lights on the device show you how your day is measuring up against your personal goals, motivating you to achieve a more active lifestyle.
This is a must have when you're wanting to workout and control what you do in your daily workout. The goals are exact and easy to customize your personal goals! Love the wake-up function and it really works without disturbing my spouse!