Meet O2Ring-S — the upgraded version of our best-selling O2Ring, now with faster 1s tracking, more accurate readings, and a full 24-hour battery life.This smart ring pulse oximeter continuously monitors your oxygen, pulse, and movement while you sleep, and gently vibrates to alert you if anything goes wrong. Next-gen algorithm with 1-second data capture. Vibration alerts for low oxygen or abnormal pulse rate. Comfortable, flexible ring, fits any finger. Type-C USB for easy charging. 24h continuous runtime for reliable tracking all day and night. Detailed, easy-to-read oxygen reports on ViHealth app (iOS/Android) and PC. No subscriptions. Free lifetime access to data & reports. 1-year warranty and 30-day money-back guarantee.