Fitbit Flex 2: An Easy Guide to the Best Features The trend towards a healthier lifestyle has become more prominent in recent times. With this, has also grown the demand to monitor this healthier way of living. In come devices like the Fitbit Flex 2. The new activity tracker, released to the public in September of 2016, is designed as a means of monitoring diet, sleep habits and practices as well as daily exercise regiments. The device, built to serve as an enhancement to the initial Fitbit Flex of 2013, has a number of features redesigned to offer enhanced user experience. The new Fitbit Flex 2 offers users extended time; lasting up to 5 days, interchangeable accessories, the new SmartTrack exercise recognition program, call and text notification capabilities as well as availability in a number of color options. The new fitness device also boasts an LED display for monitoring movement, an auto Sleep tracker and all-day activity monitoring. The device is designed to be swim proof; allowing users to enjoy water based activities freely.