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 display with high color gamut, ultra-narrow bezel, and large screen area. Delivers rich colors and vivid visuals. 2. Supports over 50 sports modes with precise real-time heart rate monitoring and intelligent algorithm tracking. Records workout data in real time for improved performance and safety. 3. Built-in optical heart rate sensor enables 24-hour accurate heart rate monitoring. LED lights on the back detect blood flow changes through the wrist. 4. Equipped with advanced PPG bio-tracking optical sensor for blood oxygen level monitoring. Helps track oxygen saturation levels during rest or after physical activity. 5. Wrist-based thermometer with 24-hour temperature monitoring. For accurate results, ensure the sensor is in full contact with skin after wearing for at least 10 minutes. Note that 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