Notes: 1. Be compatible for Android (os 4.3 or above and bluetooth must be 4.0 or above); for iphone (os 7.0 or above and bluetooth must be 4.0 or above) 2. Normal standby time lasts for 3 to 5 days, while standby time can only last for 2 days if heart rate monitor and palming bright screen open all day. Introduction: This DFit smart wristband with OLED screen clearly displays health parameters including time and date, steps, distance, calories as well as heart rate. With adjustable wristband and light weight feature, you can wear it to do exercise, such as running, climbing. When you do exercise, it can record your sports data. When you sleep, it will monitor your sleep. It can also wake you up by vibrating gently. All those data can be synchronized and analyzed on your smart phone. High performance and advanced smart features are the best advantages so that DFit smart wristband is your indispensible personal fitness companion. It's our pleasure to provide you a funny and healthy life. Main Features: 1. Display Health Parameters This smart wristband can display the time, date, steps, distance and calories clearly. Let you know your sports data immediately! 2. Sync Sports Data When bluetooth paired your smart phone, you can sync your data to Android phone and IOS phone. It gives you a real-time assessment of your exercise throughout the day.(APP:HPlus Watch) 3. Heart Rate Monitor It can monitor your heart rate to help you do exercise and adjust your trainning plan scientifically. 4. IP68 Waterproof The IP68 waterproof allows bracelet to be held in the rain, in the process of washing hands, bathing, taking shower, and swimming etc. 5. Calls/SMS Notification When you have calls or SMS, the smart bracelet will vibrate to remind you. 6. Sleep Monitor Are you curious about your sleep quality? Sleep monitor function will provide you the answer. 7. Alarm Clock Don't be afraid that your alarm would wake up others because this vibration function just wake you up! 8. Sedentary Reminder Bluetooth heart rate wristband will remind users to take timely rest to avoid fatigue to maintain good health according to your working time. 9. Low Power-wasting and Long Standby Time Charging time lasts for 30 minutes and normal standby time lasts for 3 to 5 days.( Standby time can only last for 2 days if heart rate monitor and palming bright screen open all day) 10. Palming Bright Screen Long press the touch key to turn on/off the the wristband. After turning on this wristband, the screen is lighted when the wristband is horizontal. 11. Comfortable Adjustable Wristband and Light Weight The wristband is adjustable, you can adjust it for you wrist. The perimeter is between 10.24"-7.48". It is just 27g! When you wear it, you even won't feel it! You can work and exercise ordinarily. 12. Multi-language APP language: English, German, French, Spanish, Portugal, Japanese and Czech. 13. Standard Time and Military Time Standard Time and Military can suit different people.