Product model: F57L Screen size: 1.91 inches, 280 x 320 pixels Battery capacity: 260mAh Compatible operating systems: iOS 9.0 and above, Android 4.4 and above Charging method: Magnetic suction charging cable Band color options: Metal black, champagne gold Specifications: 1. [1.91-inch high-definition large screen] Features a high color gamut, ultra-narrow bezel, and large display with rich, delicate colors for realistic and vivid visuals 2. [50+ sports modes] Supports over 50 professional sports modes with precise real-time heart rate monitoring and AI algorithm. The watch records various activity data in real time to support efficient and safe workouts 3. [Heart rate monitoring] Equipped with an optical heart rate sensor for 24-hour daily high-precision heart rate tracking. The LED light on the back emits light onto the wrist to monitor blood flow rates 4. [Blood oxygen detection] Features advanced PPG biometric tracking optical sensors. Can be used to measure blood oxygen levels when feeling tired or after exercise, allowing timely adjustments 5. [Wrist thermometer with 24-hour temperature monitoring] The bottom temperature sensor must be in full contact with the skin during body temperature measurement (recommended after wearing for 10 minutes). Temperature readings may be affected by ambient temperature differences and are intended for reference, warning, and reminder purposes only Package included: 1 x Bracelet 1 x Charging cable 1 x User manual