Description: Product model: F57L Screen size: 1.91 inches 280 320PX Battery capacity: 260mAh App operating system: IOS 9.0 or above, Android 4.4 or above Charging method: magnetic suction charging wire Band color: metal black, champagne gold Specifications: 1 1.91 inch high-definition large screen High color gamut, ultra narrow border, and large display screen. Rich and delicate colors, realistic and vivid visuals 2 50andSports Modes Supports up to 50andprofessional sports modes, based on precise real-time heart rate monitoring and Al algorithm. The watch will record various data during movement in real-time, ensuring more efficient and safe movement. 3 Heart Rate Monitoring The watch is equipped with an optical heart rate sensor, which can perform daily 24-hour high-precision heart rate monitoring. The LED light on the back shines light onto the wrist, and the different flow rates of blood are monitored 4 Blood Oxygen Detection The smart watch is equipped with advanced PPG biological tracking optical sensors. When tired or after exercise, it can be easily measured and adjusted in a timely manner. 5 Wrist thermometer, 24-hour temperature measurement When testing body temperature, the bottom temperature sensor must be in full contact with the skin (test after wearing it for 10 minutes). The temperature test will be affected by the environmental temperature difference and only serves as a warning and reminder. Package Included: 1 Bracelet 1 Charging cable 1 Instructions