Description: Product model: F57L Screen size: 1.91 inches 280 * 320PX Battery capacity: 260mAh Application operating system: IOS 9.0 or above, Android 4.4 or above Charging method: Magnetic suction charging cable Strap color: Metallic black, champagne gold Specifications: 1【1.91-inch high-definition large screen】High color gamut, ultra-narrow bezel, large display. The colors are rich and delicate, and the visual effects are real and vivid 2 [50+ Sports Modes] Based on accurate real-time heart rate monitoring and AI algorithm, it supports up to 50+ professional sports modes. The watch will record various data during exercise in real time to ensure that exercise is more efficient and safer. 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 to monitor the different flow rates of blood. 4【Blood Oxygen Detection】The smart watch is equipped with an advanced PPG bio-tracking optical sensor. When tired or after exercise, it can be easily measured and adjusted in time. 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 ambient temperature difference and is only used as a warning and reminder. Packing list: 1 * bracelet 1 * charging cable 1 * instruction manual