Usay’s proprietary algorithm runs on the ring, combining sleep, stress, heart rate, HRV, activity, and other signals over time to estimate your Body Energy* without needing to check your phone. One, two, or three lights show your status.

Usay Ring 1 is equipped with three built-in LED lights that provide real-time body feedback without opening the app. Simply rotate your wrist 180 degrees to bring the light panel into view.

• 3 Lights-Energized｜Feeling great. Ready for anything.
  
• 2 Lights -Balanced｜Keep moving at your own pace.
  
• 1 Light-Recharge｜Slow down, rest, and recharge.
  
• All Three Lights Flash ｜Pause and Check In
  

*Body Energy is Usay’s proprietary metric, estimated from sleep, heart rate, HRV, activity, and stress data collected by Usay Ring 1. It is intended for general wellness purposes, not as a medical measurement.

We strongly recommend using the free official sizing kit for the most accurate fit. Wear the sizing ring for at least 24 hours (including sleep), then submit your size through your order.

It is a built-in text and voice assistant. You can ask everyday questions in natural language, such as “How did I sleep last night?” or “Why am I under so much stress?”, without needing to read complex data charts.

The standard version is free with every ring, offering approximately 10 text interactions per day, which meets most users’ daily needs.

No subscription is required. All core health metrics, including sleep, stress, heart rate, and vascular vitality, are available for free during our extended free access period. 

Usay Ring 1 works with smartphones running iOS 10 or later, Android 15 or later, and Bluetooth 5.0 or above.

Please do not refer to your ordinary‑jewelry ring size. Obtain our free sizing kit upon checkout, and we will deliver the ring‑sizing tool to you beforehand. Wear the sizing ring for a minimum of 24 hours including your sleeping hours. After that, fill in your confirmed ring‑size information on the order page. We will dispatch your formal smart‑ring afterwards.

Usay Ring 1 is available in sizes #6 to #14. We strongly recommend using our free sizing kit before purchasing to ensure a perfect fit.

No. Each brand’s sizing tools differ in sensor placement and inner structure. Only the official Usay sizing kit guarantees accurate measurement results.

We strongly recommend wearing it on your index finger for the most accurate data, especially for vascular vitality and sleep tracking. The index finger has stronger arterial blood flow, providing better sensor signal quality.

Raise your hand and apply ice to reduce swelling. Then use soap, lotion, or oil to lubricate your finger and gently twist the ring off. You may also use the dental floss method to slide it off. Do not force the ring off. Seek medical help immediately if your finger becomes discolored, numb, or painful.

Outer layer: aerospace-grade titanium alloy

Inner layer: epoxy resin 

Yes. It has an IP68 waterproof rating. You can wear it while washing hands, showering, and swimming.

A full charge lasts 3 to 5 days, depending on usage of LED lights and real-time monitoring features. The included charging case provides enough additional power for over 50 days of backup charging. Simply place the ring in the case to recharge anytime.

Yes. Usay Ring 1 monitors vascular vitality 24/7. Its proprietary algorithm tracks long-term trends to help identify potential health risks early. All data is for wellness purposes only and not intended for medical diagnosis.

We use a 4-stage sleep model (Awake, Light Sleep, Deep Sleep, REM). Combined with HRV, nighttime SpO₂, and sleep temperature data, it generates a comprehensive sleep quality score.

Search “Usay” in the Apple App Store or Google Play Store to download the official app.

Usay Ring is intended for general wellness and fitness purposes only and is not a medical device. The information provided is not intended for diagnosing, treating, curing, or preventing any disease.