Smart Ring for health, activity and sleep tracking. App and compatibility: Syncs with a smartphone app on Android or iOS. The app stores your data and presents detailed charts to monitor activity progress and health status at any time. Accurate activity and sport tracking: Records steps, distance, calories, and heartrate changes throughout the day and during workouts. Supports multiple sport modes, including walking, running, cycling, and a range of indoor and outdoor activities. Lightweight, durable design: Weighs 3.6 g. Enamel finish with vibrant colors and a subtle luster adds depth and style while staying comfortable for extended wear. Health monitoring: Optical sensor measures heart rate and blood oxygen saturation. A builtin gravity sensor estimates sleep duration from movement and provides feedback on sleep quality. Use scenarios: Everyday monitoring at work and home; training sessions (run, bike, gym) with sport modes and heartrate tracking; nighttime sleep tracking for recovery and planning next day.