The Amazfit Helio Ring is an ultra-lightweight, premium titanium smart ring engineered to deliver comprehensive athletic performance metrics and 24/7 health tracking. Crafted from durable titanium alloy with a skin-friendly resin inner layer, it combines 10 ATM water resistance with cutting-edge biosensors in an ultra-slim form factor. The Amazfit Helio Ring represents the pinnacle of smart wearable engineering, purpose-built for athletes and fitness enthusiasts seeking deep performance and recovery insights. Crafted from a high-grade titanium alloy outer shell paired with a hypoallergenic, skin-friendly resin inner layer, it measures a slim 2.6 mm in thickness and weighs under 4 grams, ensuring an unnoticeable yet durable presence on the finger. Engineered with advanced biometric monitoring capabilities, the smart ring features a BioTracker PPG optical sensor, skin temperature sensor, and Electrodermal Activity (EDA) sensors. These precise sensors continuously track heart rate, blood oxygen saturation (SpO2), stress levels, and emotional responses through minute variations in skin conductivity, offering comprehensive health analytics directly from the finger where vascular readings are exceptionally accurate. Comprehensive athletic performance support allows users to monitor critical workout data such as VO2 Max, training load, and recovery times across dedicated sports modes. The smart ring pairs seamlessly with the Zepp App to provide race achievement predictions based on running and walking metrics, and easily synchronizes workout data with leading third-party platforms including Strava, Adidas Running, Komoot, Relive, Apple Health, and Google Fit. Sleep analysis is elevated with in-depth monitoring that tracks sleep stages (including REM), sleep breathing quality, nighttime heart rate, heart rate variability (HRV), and daytime naps. Upon waking, users receive a personalized readiness score reflecting mental and physical recovery to help optimize daily training loads and lifestyle balance. With robust 10 ATM water resistance capable of withstanding water pressure up to 100 meters, the Amazfit Helio Ring is fully equipped for swimming and water sports. It supports wireless charging via a dedicated dock. Ring Size: 12 Outer Material: Durable Titanium Alloy Inner Material: Hypoallergenic Resin Ring Dimensions: 8 mm width, 2.6 mm thickness Weight: 3.82 g (Size 12) Sensors: BioTracker PPG heart rate sensor, temperature sensor, EDA (Electrodermal Activity) sensor Motion Sensors: 3-axis accelerometer, 3-axis gyroscope Connectivity: Bluetooth Low Energy (BLE) Charging Method: Wireless charging Compatibility: Android 7.0 and above, iOS 14.0 and above Companion App: Zepp App Health Tracking: 24/7 Heart Rate, SpO2, EDA Stress Monitoring, Skin Temperature, PAI System, Menstrual Cycle Tracking Sleep Tracking: Sleep Stages (REM, Light, Deep), Sleep Breathing Quality, HRV, Daytime Nap Detection, Readiness Score Athletic Features: VO2 Max, Training Load Analysis, Recovery Time, Race Predictions Third-Party Sync: Strava, Adidas Running, Komoot, Relive, Google Fit, Apple Health