FitBit Flex Wireless Activity Writsband - Teal (Certified Refurbished) This Certified Refurbished product is 3rd party refurbished, shows limited or no wear, and includes all original accessories plus a 90-day warranty Refurbished Warranty. Monitor how long and well you sleep LED lights show how your day is stacking up against your goal Tracks steps, distance, calories burned and active minutes Sync stats wirelessly and automatically to your computer and over 150 leading smartphones