Smart ring activity tracker Ultrahuman AIR — grey, LiPo 24 mAh, up to 6 days battery, USB-C

Ultrahuman AIR is a smart ring activity tracker in a round, low‑profile form designed for continuous wearable monitoring. The grey Ultrahuman AIR combines a 24 mAh lithium‑polymer battery with up to 6 days of battery life and charges via the supplied USB‑C to USB‑C cable. Weighing approximately 2.4 grams and measuring about 2.4 mm in thickness, the ring offers a discreet alternative to bulkier wearables while recording activity and health metrics on compatible devices running Android 8–13 or iOS 15–16.

Advantages

The Ultrahuman AIR delivers a lightweight, nearly invisible design that is comfortable for all‑day and nighttime wear. Continuous tracking captures sleep metrics, skin temperature, heart rate variability (HRV) and movement indices without the bulk of a typical smartwatch. With intuitive charging via USB‑C and multi‑day battery life, the ring supports extended use between charges. The product provides automated insights such as a consolidated Sleep Index, temperature trends, circadian phase response mapping and personalised nudges for small behaviour changes.

Suitable for

• Everyday activity monitoring for users seeking a low‑profile wearable
• Sleep tracking and sleep quality assessment
• Monitoring recovery and readiness using HRV data
• Tracking skin temperature trends related to lifestyle or health
• Users who prefer discreet devices for continuous glucose‑related movement guidance

Key specifications

• Form factor: round smart ring, slim profile (~2.4 mm thickness)
• Weight: ~2.4 g
• Battery: 24 mAh lithium‑polymer, up to 6 days typical battery life
• Charging: USB‑C to USB‑C cable included
• Compatibility: Android 8–13 and iOS 15–16
• Sensors and metrics: continuous heart rate/HRV, skin temperature tracking, sleep index, movement index, circadian phase response mapping
• Design: low‑profile, discreet for all‑day and night wear

How to use

Fit the Ultrahuman AIR on a finger that feels comfortable and secure; the slim profile is intended for continuous wear, including sleep. Charge the ring using the included USB‑C to USB‑C cable until fully charged before first use. Install the Ultrahuman companion app on a compatible Android or iOS device, pair the ring following on‑screen instructions, and allow the app to access required sensors and permissions. Wear the ring continuously to enable automatic recording of sleep, movement, skin temperature and HRV data; sync with the app periodically to review insights and trends.

Usage recommendations

For consistent data and accurate sleep or temperature trends, wear the ring continuously for several consecutive nights and keep it charged so it remains active through the monitoring period. Use the personalised nudges and sleep index in the companion app to inform small lifestyle adjustments and schedule charging at a regular time to maintain uninterrupted tracking.