Smart Ring Ultrahuman Ring AIR — Sleep & Fitness Tracker, Size 7, Silver, 6-day Battery

Ultrahuman Ring AIR is a low-profile smart ring designed for continuous sleep and fitness monitoring in a lightweight, discreet form. In a round silver finish and size 7, the ring provides continuous heart rate and activity tracking, sleep analysis using a Sleep Index, skin temperature monitoring, movement and HRV insights, and personalised nudges. The ring uses a 24 mAh LiPo battery for up to 6 days of typical use and includes a USB-C to USB-C charging cable. Compatible with Android 8+ and iOS 15+.

Advantages

The ring combines a very light and slim form factor with continuous biometric sensing, offering sleep, activity, temperature and heart-rate data without a bulky device. Its Sleep Index aggregates total sleep duration, resting heart rate and restfulness into a single metric. Temperature tracking and HRV insights support recovery and health monitoring while personalised real-time nudges help with behaviour adjustments.

Suitable for

• People who want unobtrusive, 24/7 sleep and activity monitoring
• Users seeking continuous heart-rate and HRV metrics for recovery tracking
• Anyone wanting simple sleep scoring and skin temperature trends
• Individuals preferring a compact wearable with multi-day battery life

When it may not be suitable

The ring’s very slim and discreet design prioritises comfort and basic biometric tracking; it is not a full-featured smartwatch replacement and lacks a display for on-device interaction. If you require built-in GPS, a large screen, or advanced smartwatch apps, this ring may not meet those needs.

Key specifications

• Form factor: round smart ring, low-profile, size 7, silver finish
• Weight and thickness: extremely light and slim (designed to be unobtrusive)
• Sensors and metrics: continuous heart-rate monitoring, HRV insights, sleep index (sleep duration, resting heart rate, restfulness), skin temperature tracking, movement index
• Connectivity: Bluetooth
• Battery: 24 mAh LiPo, up to 6 days typical battery life per charge
• Charging: USB-C to USB-C cable included
• Compatibility: Android 8+ and iOS 15+

How to use

Wear the Ultrahuman Ring AIR on the recommended finger for a comfortable fit and keep it in place for continuous data collection. Pair the ring with the Ultrahuman app on a compatible Android or iOS device via Bluetooth to view sleep, activity, temperature and heart-rate metrics. Charge the ring using the supplied USB-C cable when battery levels are low; typical charge cycles provide up to six days of use.

What to consider before purchase

• Check that size 7 fits comfortably — ring sizing affects sensor accuracy and comfort
• Verify your phone meets compatibility requirements (Android 8+ or iOS 15+)
• Consider whether you need smartwatch features like a display, on-device apps, or GPS
• Battery life expectations: up to 6 days depending on usage and sensor sampling

Usage recommendations

For best results, wear the ring continuously, ensure a snug but comfortable fit, sync regularly with the app, and charge before the battery is depleted. Use sleep and movement indices alongside HRV and temperature trends to monitor recovery and daily readiness.