Fitbit Ace 2 Activity Tracker for Kids Watermelon/Teal - One Size Steps & active minutes tracking lets kids skip, jump & move their way to a healthier life Kids earn virtual badges and fun on-screen celebrations when they reach their goals.Operating temperature: 14° to 113° F Bring on the pool party cannonballs or lunchtime spills. Ace 2 is swim proof (water resistant to 50 meters) Kids spend less time charging & more time moving with up to 5 days of battery (varies with use and other factors; animated clock faces require more frequent charging) Pair ace 2 to a child account to access a limited kid view. Kids can also challenge their friends to step competitions & send each other messages or cheers in app Helps kids get the sleep they need with sleep tracking, bedtime reminders and silent alarms