Smart ring Ultrahuman Ring Air Size 09 — Aster Air Black, PPG SpO2, USB-C, 6-day battery

The Ultrahuman Ring Air Size 09 — Aster Air Black is a compact smart ring activity tracker designed for continuous biometric monitoring in a low-profile, 8.1 mm round form factor. Using infrared photoplethysmography (PPG), the ring measures blood oxygen (SpO2) and other physiological signals to provide daily health and activity insights. A built-in 24 mAh LiPo battery delivers up to six days of use on a single charge and recharges via USB-C for convenient, fast top-ups. The ring focuses on sleep tracking, recovery analysis, heart rhythm monitoring and daily activity metrics to help users track trends and make data-driven adjustments to lifestyle and training.

Advantages

The Ultrahuman Ring Air provides continuous passive monitoring of key biometric signals including SpO2, heart rhythm, and motion data, enabling 24/7 tracking without bulky wearables. Its small width and round design make it comfortable for day and night use while the infrared PPG sensor permits nocturnal measurements such as AFib detection, sleep-stage analysis and recovery scoring. Long battery endurance and USB-C charging reduce friction for everyday use, and the accompanying analytics translate raw signals into actionable metrics like sleep score, recovery score, VO2 Max estimation and activity summaries.

Suitable for

• People who want continuous sleep tracking and daily sleep scores
• Users seeking passive recovery and HRV-informed recovery insights
• Athletes and fitness-minded users tracking steps, calories, distance and VO2 Max
• Individuals interested in overnight heart rhythm monitoring and early AFib detection
• Anyone who prefers a discreet, low-profile wearable for 24/7 health tracking

Key specifications

• Form factor: round smart ring, 8.1 mm width
• Biometric sensors: infrared PPG for SpO2 and heart rhythm monitoring
• Battery: 24 mAh LiPo, up to 6 days of typical use
• Charging: USB Type-C charging interface
• Monitoring features: continuous activity tracking, sleep stages, sleep score, recovery score, HRV-based insights, AFib detection, VO2 Max estimation
• Activity metrics: steps, distance, calories, movement logging

How to use

Place the Ultrahuman Ring Air on the finger size 09 and pair it with the compatible mobile application following the in-app pairing steps. Wear the ring continuously, including during sleep, to capture uninterrupted biometric and motion data. Charge the ring using the provided USB-C charger when battery levels are low; a single full charge typically supports up to six days of regular use. Use the app to view daily sleep scores, recovery analysis, heart rhythm reports and activity summaries, and to adjust personal settings such as dominant hand, activity goals and notification preferences.

Usage recommendations

For best data quality, wear the ring snugly but comfortably on the finger that gives the best fit; avoid loose placement. Keep the sensor area clean and dry, and charge the ring regularly to ensure continuous monitoring. Use nightly sleep reports and recovery scores to plan rest, naps and training intensity. Consult a healthcare professional if the device indicates potential AFib or other irregular heart rhythm findings that require medical attention.