BodyMedia FIT is an on-body monitoring system that consists of the BodyMedia FIT Armband monitor, online Activity Manager*, an optional Display and free downloadable apps for mobile device users. BodyMedia FIT Armbands automatically track the calories burned during your daily activities from pumping iron to using an iron and monitor the quality of your sleep, an important factor in weight loss. The information tracked can easily be managed with BodyMedia's online Activity Manager. Add in the easy-to-use food log and you have the right information to improve your weight loss.*Subscription required.All BodyMedia FIT Armbands use four sophisticated sensors to capture over 5,000 data points per minute to track everything from calories burned, steps taken and levels of physical activity to sleep. BodyMedia FIT Armbands give you the most accurate calorie burn* in the market, and the technology used in the BodyMedia system has been clinically proven to improve weight loss by 3x!The LINK Armband, enabled with Bluetooth wireless technology, sends information to your fingertips by communicating directly with your smartphone and providing near real-time caloric burn data.*Formerly known as Armband BW (name and packaging graphics change only)