NIKE+ Fuelband SE Fitness Tracker (Black/Purple, Small - 5.79") (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty Available in three sizes: Small (5.79 Inch/147mm), Medium/Large (6.77 Inch/172mm) and Extra-Large (7.76 Inch/197mm) Measures how much you move or don't move throughout the day using NikeFuel, a universal way to measure movement for all kinds of activities LED display with 100 white LED lights shows daily goal progress, time, NikeFuel earned, calories burned and steps taken Compete with or motivate friends and family, compare stats, or set goals through the online Nike+ Groups (available for iOS only)