R02 Smart Ring, Smart Ring for Women and Men, No Subscription Fee, with a Charging Case, Supports Heart Rate, Blood Oxygen, Sleep Health...

No subscription fee is needed: No more monthly bills! This smart ring does not require any app subscription fee. Enjoy all features right away, instantly unlocking core data like heart rate monitoring, sleep analysis, and 24/7 activity tracking, making health management straightforward and simple. Purchase a sizing kit: Before buying the smart ring, it is highly recommended that you purchase a sizing kit or measure your finger size according to the size chart to help you select the correct ring size for a comfortable fit. Heart rate measurement: 24/7 smart heart rate measurement lets you understand your heart rate status and monitor heart rate abnormalities, keeping track of your daily health. Battery performance: Your usage frequency determines power consumption. Basic Mode (4-5 days): Tracks only steps and basic sleep. Balanced Mode (3-4 days): Synchronizes heart rate every 60 minutes. Enhanced Mode (2-3 days): Monitors heart rate in real-time throughout the day. Requires frequent daily charging. Portable charging case: Comes with a compact charging case for charging anytime, anywhere. Nighttime sleep insights: Tracks continuous night rest for holistic wellness trends. Note: The algorithm is strictly calibrated for nighttime cycles to ensure data purity. Daily health tracking: Tracks long-term activity trends through natural arm swings. The algorithm filters out stationary hand movements to prevent data errors. Supports achieving holistic health and lifestyle goals. To avoi