Question: what is the difference between fitbit flex 1 and 2?
Answer: Fitbit Flex 2 v Fitbit Flex: Design The two Flex bands aren't that different in terms of their simple design. The original Flex has a tracker with LEDs that light up when tapped to show your goal progress. ... The Flex 2, however, is the company's first swim-proof tracker and is capable of being dunked up to 50m.