features ultra thin body, lightweight and portable, comfortable to wear. Stylish design combined with high-end material, it gonna be shining on your wrist. Features: General Design: B2 smart band features ultra thin body, lightweight and portable, comfortable to wear. Sports Tracking: Exercise distance, pace, real-time heart rate, heart rate range and other data, you can check it by raising your hand. Rich data analysis make your training more scientific. Health Assistant: Continuous detection and recording of heart rate, test your blood pressure anytime, to help you better understand your physical condition. Scientific Sleep: Automatic recognition of sleep time, accurate detection of deep sleep, light sleep, awake at night, wake up time, and sleep quality. Sedentary Reminder: Reminds you to relax when you have seating for a long time, help you to live a healthier life.