Fitbit Flex (1st Gen) Activity Tracker & French Bull designer wristband set.

Pre-owned original Fitbit Flex #FB401BK wireless wristband. Was only used briefly for a research study and has been re-set to factory settings. IOS compatability with Mac and Windows. Includes one tracker, charging cable, wireless sync dongle, two black wristbands, small and large. Also includes NIB colorful, adjustable watch-style wristband to fit most wrists. Never used or opened. This is water resistant. Can track day activity and nightly sleep patterns. From a SFPF home.