The BrawRing M2 features an ultra-long battery life of 20–30 days on a single charge. This is powered by a high-efficiency 18–32mAh battery.

Please refer to the tips below:

1. Wearing the ring properly

The sensor inside your ring should be on the palm side of your finger. The ring should fit securely and comfortably around your finger's base.

2. Evaluate the fit

1.) Make sure your fingers are within average body temperature. Your fingers expand and contract based on environmental factors.

2.) We recommend wearing your sizing ring for at least 24 hours to confirm the best fit. (Your ring should not rotate as you perform regular daily tasks.)

3.) Wear it throughout the night. Your finger may be slightly larger in the morning.

4.) Choose the proper knuckle for your ring. A ring that is too tight or too loose is not suitable for accurate data measurement.

3. How to determine between the two sizes

We recommend choosing the smaller size in between to get more accurate measurements, or sending pictures and videos to us to assist you in choosing the best-fit size.

The sensors in the BrawRing have been tested against laboratory results in multiple validation studies.Wearables differ in where they're worn, the sensors they use, and how they process data. For the most consistent and meaningful insights, it's best to track trends and changes over time within your BrawRing and BrawRing App, rather than comparing your BrawRing results to those from other devices.

Absolutely! You can use BrawRing without any subscription. It offers lifetime free access to all features, allowing you to receive detailed analysis reports and personalized guidance.