- Combined Health & Fashion: An elegant aluminium smart ring that is wear-resistant and corrosion-resistant. It accurately tracks steps, distance and calories, and supports indoor/outdoor running, treadmill workouts and fitness walking. - Smaller but More Powerful: Built-in high-performance heart rate sensor with a green light sensor for quick heart rate and sleep measurements. The companion app can also measure heart rate for deeper health insights. - Know Your Sleep: Automatically monitors nighttime sleep, records duration, and analyzes sleep data and depth. - Small Size, Large Capacity: 15 mAh battery delivers about 5–7 days of use per charge. An enclosed structure provides waterproof and safe charging for longer life. The charging compartment houses a battery that can store power to charge the device roughly 13 times when fully charged. Convenient to carry for travel or daily use. - IP67 Waterproof & Compatibility: Sweat, wash hands and everyday activities are fine (do not soak in hot water or sea water). Supports iOS 8.0+ and Android 5.1+. - Gift Idea: A thoughtful gift for men and women that blends fashion with health awareness, suitable for anniversaries, birthdays, Christmas and other occasions. - Use Scenarios: 1) Daily activity tracking during work, commute or travel. 2) Sleep monitoring to improve rest quality. 3) Outdoor runs or gym workouts with heart rate and activity tracking.