Quality Sleep Scientific track your sleeping circle and show your whole sleep period with deep/light sleep, Wake-up and REM etc. Even work for a short nap in the daytime. Go and achieve your sleep goals. Ideal Lock Screen with IP68 waterproof The thoughtful setting is designed for avoiding the mistakes of the water, or something touched—also sweat-proof, rain-proof and splashed waterproof etc., for your convenience. Sport Tracker Simply press the sensitive button to track your real-time heart rate, steps, distance, calories burning when doing excises. Easy to get your goals. Instant Message Notification With the notification feature, you will never miss any messages important to you. Just check on your wrist when you're not available to access your phone. Brightness Adjustment The adjustable screen brightness makes this tracker better to fit you no matter in the sun or dark. Up to 5 days with a fully charged battery for daily progress.