0.96 inch OLED large screen, touch control button Real-time static and dynamic heart rate monitoring Sports and fitness tracking: distance, pedometer, calorie burn, fitness goal setting, fitness information sharing IP67 waterproof: resistant to water and dust; suitable for wearing during rain, hand washing, and showering without removal Call and message reminder: vibrates to alert incoming calls and messages from iOS and Android phones via Bluetooth connection Sleep monitor: tracks and analyzes sleep quality, including time to fall asleep and duration of deep sleep Sedentary alert Time and alarm clock functions Anti-lost feature: alerts when phone moves out of Bluetooth range Remote camera control: remotely trigger smartphone camera within 10 meters Bluetooth connectivity Battery level display Specifications: Item size: 43x18x12mm Band size: 245x20x12.8mm Strap material: TPU Color options: Black, Dark Blue, Purple, Red, Green Hardware: Display: 0.96 inch OLED Motor: built-in vibration motor Heart rate monitoring: supports both static and dynamic measurement Battery capacity: 45mAh Charging time: approximately 11.5 hours Standby time: up to 5 days (with Bluetooth off) Wireless range: 510 meters System compatibility: Compatible with Android and iOS smartphones Requires Android 4.3 or above, iOS 8.0 or above, and Bluetooth 4.0 Data synchronization via Bluetooth to mobile app Stores up to 7 days of exercise data App interface languages: Chinese, English, Spanish, French, Portuguese, Dutch, Russian Notification language support: Chinese, English, Spanish, French, Portuguese Operation method: touch button controls