Product model: F57L Screen size: 1.91 inches, 280 x 320 pixels 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 professional sports modes, based on precise real-time heart rate monitoring and AI algorithm. The watch records various activity data in real time, supporting efficient and safe workouts 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 rates 4. [Blood oxygen detection] Features advanced PPG biological tracking optical sensors. Can be used to measure blood oxygen levels when feeling tired or after exercise, allowing timely adjustments 5. [Wrist thermometer, 24-hour temperature measurement] When measuring body temperature, ensure the bottom sensor is in full contact with the skin (test after wearing for 10 minutes). Temperature readings may be affected by ambient temperature differences and are intended for reference and alerts only Package Included: 1 x Bracelet 1 x Charging cable 1 x User manual