The Nocturne Smart Ring has advanced smart-sensing technology with a comfortable, unisex design which helps you better understand your sleep, recovery and daily wellbeing through detailed tracking and analysis. Tracking features described below: Key Features Tracks total sleep time, deep sleep, light sleep and REM sleep. Monitors sleep duration, sleep cycles and sleep efficiency. Measures heart rate, blood oxygen (SpO₂) and heart rate variability (HRV). Tracks skin temperature fluctuations and stress levels. Compatible with the LuckRing app for detailed health reporting. IP68 Waterproof Magnetic Charging The Science Many of the body's most important health signals can be measured such as sleep tracking data, including deep sleep, REM sleep and sleep efficiency which can help users better understand their nightly recovery patterns. While metrics such as HRV, resting heart rate and skin temperature provide additional insights into how the body responds to daily stress, activity and rest. By continuously monitoring these metrics, smart rings can provide a more complete picture of sleep quality, recovery and overall wellbeing. How to Use Wear the Nocturne Smart Ring on your finger throughout the day and night to allow continuous tracking of your health and wellness metrics. Data is automatically collected and synced to the companion app. Full setup and user instructions will be provided with the product.