【Comfortable All-Day Wearing】 New and improved fluoroelastomer strap: Airy-light at 14 grams and wafer-thin at 8.99 mm. Soft, skin-friendly, and made to last. Sweat-wicking perforated design. Two buckles, for a snug fit and clean look. 【Sleep Health Management】 HUAWEI TruSleep 4.0. Keep tabs on your heart rate, SpO2, respiratory rate, and any abnormal breathing while you're snoozing away, for peace of mind all the time. 【Enhanced Vital Sign Tracking】 HUAWEI TruSeen 5.5 health monitoring. Stay on top of the beat, even when you're running or exercising, and get better heart rate readings, all thanks to the enhanced performance and stability bolstered by our best-in-house multi-channel module and smart fusion algorithm. And SpO2 measurements is more stable and faster. 【100 different workout modes】 Next-gen Activity Rings, to make healthy living your day-to-day reality. Pro-level swim mode,with an all-new nine-axis sensor and groundbreaking algorithm which precisely identifies all four strokes. Immerse yourself in your favourite activities, and benefit from data-driven workout evaluations, with 100 workout modes to choose from and auto-detection for four common exercises. 【Fast Charging & Durable Battery】 Charge for five minutes and use for two days, or charge for the full 45 minutes to fill your band to the brim, and wear for up to two weeks at a time! 14 days of maximum usage, 9 days of typical usage. 【Intelligent Brightness Adjustments】 New and improved ambient light sensor. The band's ambient light sensor adjusts the screen brightness automatically, to provide a comfortable view in all kinds of lighting conditions.