Fitbit Ace 3 Activity Tracker for Kids 6+, Minions Special Edition, Yellow, New We record all serial numbers and verify all returns thoroughly. Features BATTERY 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 tracking: Help kids form healthy sleep habits with sleep tracking, bedtime reminders and silent alarms; Fitbit Ace 3 lets you know if kids are getting the rest they need since good sleep habits play a big role in their health. Water resistant to 50m: Since Fitbit Ace 3 is water resistant, spills and splashes don?t stand a chance and kids can wear it in the pool and ocean. One size.