Operating system LiteOS Special features Breath Monitor, Blood Pressure Monitor, ECG, Custom Activity Tracking, Heart Rate Monitor Battery capacity 452 Connectivity technology Bluetooth Wireless communication standard Bluetooth Battery cell composition Lithium Polymer CUTTING EDGE HEART HEALTH SOLUTIONS. WATCH D packs a high-performance ECG sensor module, which provides: single-lead ECG measurements, real-time analysis, sinus rhythm, atrial fibrillation, and premature atrial and ventricular beat reminders. HEALTHY LIVING PLAN. Daily check-in tasks cover a wide range of lifestyle issues, including blood pressure, heart rate, track with sleep, SpO2, 24/7 Stress monitoring, Skin Detection as well as 70+ Workout Modes, making healthy living a seemingly automatic routine LONG LASTING BATTERY LIFE. The HUAWEI WATCH D is packed with a long lasting battery up to 7 days so you can enjoy your day to day and focus on your lifestyle. 70+ WORKOUT MODES. With 70+ workout modes to choose from, feel free to step outside your