Smart Ring Oura Ring Ultrahuman Ring AIR – Sleep and Fitness Tracker, Black, PPG SpO2, USB‑C, 6 days battery (Size 13)

The Oura Ring Ultrahuman Ring AIR is a compact smart ring in black designed for continuous sleep, recovery and activity monitoring. It uses infrared PPG sensors to measure blood oxygen (SpO2), heart rate variability and skin temperature, and pairs via Bluetooth with USB‑C charging for up to six days of battery life. The ring combines lightweight comfort with fingertip-level biometric accuracy to provide daily sleep scores, recovery insights and activity tracking without a recurring app fee for standard features.

Advantages

The ring delivers fingertip biometric readings with higher blood flow and arteriole density than wrist devices, improving the accuracy of sleep stage, HRV and skin temperature measurements. At approximately 2.4 grams and a smooth hypoallergenic inner surface, it offers a near‑invisible wearing experience suitable for round‑the‑clock use. Integrated Bluetooth connectivity and a rechargeable lithium‑polymer battery provide simple wireless syncing and up to six days of operation between charges.

Suitable for

• People who want detailed sleep stage analysis and daily sleep scores
• Users seeking recovery and HRV insights to optimise training and rest
• Anyone preferring a discreet, lightweight alternative to wrist wearables
• Those who need SpO2 monitoring and multi‑day battery life with USB‑C charging

When it may not be suitable

This smart ring may not be suitable for users who require continuous multi‑sensor wrist data such as GPS for outdoor workouts, or those who need a display on the device itself. People with very large or very small finger sizes may need to confirm fit before purchase, as accurate readings depend on proper sensor contact with the skin.

Key specifications

• Form factor: round smart ring, black, size 13
• Sensors: infrared PPG for heart rate, HRV, SpO2 and skin temperature
• Connectivity: Bluetooth 5.0
• Battery: lithium‑polymer 24 mAh, up to 6 days typical use
• Charging: USB‑C charging
• Water resistance: waterproof
• Weight: approximately 2.4 grams

How to use

Fit the ring on the recommended finger size so sensors maintain consistent contact with the skin. Charge the ring via the included USB‑C charger and pair it with the companion app over Bluetooth to enable sleep scoring, recovery metrics and activity tracking. Wear the ring continuously, including overnight, to capture sleep stages and recovery trends; sync data regularly to review scores and suggested actions in the app.

What to consider before purchase

• Confirm ring size for accurate sensor contact and reliable readings
• Check compatibility of your smartphone with Bluetooth 5.0 and the companion app
• Understand that device provides biometric insights but does not replace medical diagnostics

Usage recommendations

Wear the ring continuously, especially overnight, and keep it charged to maintain uninterrupted sleep and recovery tracking; ensure a proper snug fit and follow app guidance for best HRV and SpO2 measurement accuracy.