'Further Manufacturer's Details (for this range)...Model: Fitbit Flex Track steps, distance, calories burned and sleep Flex automatically syncs your stats to your computer and selected smartphones via Bluetooth 4.0 Set daily goals, earn badges and challenge friends to get fit Supplied with both a small and large wristband White LED indicators display your progress towards goals Tracks minute-by-minute data from past 7 days Summarises daily calories, distance and steps for past 30 days Water resistant Contents: Flex tracker, large and small wristbands