The XO J11 Silver Smartwatch offers advanced health monitoring: heart rate, sleep, and stress. Performance analysis and goal achievement. 7 days of battery life with a 2-hour charging time. Supports calls. Additional features: contacts, calculator, calendar, etc. IP68 waterproof. Features and product characteristics: XO J11 Smartwatch series, the perfect combination of style and cutting-edge technology. Analyze your heart rate, monitor your sleep, and manage your stress levels for a better quality of life. Track your performance, measure your progress, and achieve your goals with detailed and precise statistics. 2.06-inch AMOLED display with a resolution of 410x502 pixels, providing clear images even in direct sunlight.