Keep track of your movement with this Fitbit Flex 2 fitness tracker. It hides discreetly beneath jewelry on your wrist, and it's swim-proof up to 50m for use during water sports. This Fitbit Flex 2 fitness tracker displays LED lights that track your progress and notify you of texts and calls on your paired smartphone.
This Fitbit is okay for swimming but I do not believe it accurately counts the calories burned. I have a Fitbit charge HR and it is able to give me a more accurate reading of calories burned.