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 cable 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 [50+ Sports Modes] Supports over 50 sports modes, with precise real-time heart rate monitoring and AI algorithm. The watch records various data in real time, helping to improve workout efficiency and safety. 3 [Heart Rate Monitoring] Equipped with an optical heart rate sensor for 24-hour high-precision heart rate monitoring. The LED light on the back emits light onto the wrist to monitor blood flow changes. 4 [Blood Oxygen Detection] Features advanced PPG bio-tracking optical sensors. Can measure blood oxygen levels when tired or after exercise, allowing timely adjustments. 5 [Wrist Thermometer, 24-Hour Temperature Monitoring] When measuring body temperature, ensure the bottom sensor is in full contact with the skin (measure after wearing for 10 minutes). Temperature readings may be affected by ambient temperature and are intended for reference only. Package Included: 1 x Bracelet 1 x Charging Cable 1 x User Manual