Specification: Display: 0.69 inch OLED Battery capacity: 45mAh Work time: 7-10 days (without constant HR testing) Batteries Type: Lithium Polymer Input voltage: 5.0V Waterproof: IP65 (please NOT wear for HOT-WATER showering!) Heart rate sensor: Optical heart rate sensor (can turn ON/OFF) Adjustable length: 157-205 mm (6.18-8.07 inch), please do NOT buy if you have a large wrist. Bluetooth chip: Dialog top Bluetooth chip (Bluetooth 4.0) Sensor: ADI military gravity sensor Main Part: 13.7g Wristband: TPU Compatible with: Android 4.4 and above versions, and supports Bluetooth 4.0 for Android smart phones; Apple iOS 7.0 or later, For iPhone 4s- 6s Plus ( can link & sync to Apple HealthKit!). Functions: 1, US ADI optical heart-rate monitor. This is a sport device, NOT a medical device. If you have a heart problem, please get a professional HR monitor. 2, Monitor your daily fitness level, Monitor your activity levels, track walking distance and calculate calories burned. 3, Automatic sleep monitoring analyzes your sleep quality. Measure the length and quality of your sleep. Get action plans from the latest app to improve sleep quality based on data about your deep and light sleep cycles. 4. Time and date display 5. Personal information setting 6. Exercise tracking (steps, miles, calories) 7. Sleep testing (time and quality) 8. Fitness target setting 9. Fitness information sharing (like Apple Health & WeChat, FB) 10. Coming call reminding 11. Message reminding; Sedentary/sitting reminder; 12. Anti lost alert function (over range) 13. Touch control, easy to operate 14. A detailed APP download and installation guide is enclosed.
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