Lowest price ever on the Fitbit Ace 3 Activity-Tracker for Kids. Get it in Blue or Black for just $39.95! 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