Built-in 65mAh battery, normal use time about 10 days or so. Call & SMS social message alert: Message smart remind, remind you anytime, anywhere. Real-time heart rate monitoring: With a built-in motion sensor, real-time measurement of heart rate to adjust the intensity of exercise. Tracking daily activities data: Record steps, distance, calories, activities time. Check daily activities data anytime.USB charge: No need data cable anymore, convenient, . Bluetooth 4.0, Support IOS 7.1 Android4.4 Above system equipment.