Fitbit Ace 3 for Kids - Black/Racer RedBATTERY LIFE: Up to 8 days of battery Compatibility: Compatible with iOS 12. 2 or higher & Android OS 7. 0 or higher Animated Clock Faces: Fitbit Ace 3 makes fitness fun with animated clock face characters that change and grow as kids make progress toward their goal throughout the day All day activity tracking: Fitbit Ace 3 tracks all day steps, and Active Minutes show how every move, skip and jump adds up to a healthier, more active life Sleep