Buy with confidence!!! [ULTRA SLIM STRAPS] This exclusive ultra-slim and lightweight fitness tracker is specially designed for kids 4-15 s old, with a total weight of only 17g, with more emphasis on children's wearing comfort, make kids more willing to wear and build healthy habits. [ALL-DAY ACTIVITY TRACKING] Automatically tracking your kids steps, distance and calories burning, you can see the data easily by tapping the watch display or checking your phone's app. [SLEEP TRACKER SILENT ALARM CLOCK] Automatically track how well you sleep at night, get the data about your sleep trends through the night in the app.The silent alarm clock can wake you up without disturbing others. [BUILT-IN USB DESIGN LONG BATTERY TIME] You can charge the fitness tracker by any USB adapter without requiring an extral charger. Charging for 1-2 hours, the fitness tracker battery can last up to 7 days. [COMPATIBILITY] kids fitness tracker watch With app "VeryFitPro" , Compatible with smartphone.