The $30 million smart ring market gets a crucial design tweak

A small notch on the Oura Ring 4 has sparked debate among users, but its purpose is clear: to aid in accurate data collection. the Oura Ring 4 boasts a classy design, but some models feature a small notch or dimple that runs vertically on one side.

This notch serves a specific purpose - it aids in the accurate capture of data by positioning the sensors properly on the finger. the sensors, including photoplethysmography (PPG), temperature, and accelerometer, need to be positioned correctly to detect changes in the absorption of light, temperature rhythms, and movement.

Positioning the notch for optimal results

The notch on the Oura Ring is essentially telling you where the bottom of the ring is and what side should not be visible from the top of your hand. This is especially important for models like the Oura Ring 4 that have recessed sensors and don't emit bright, visible LED lights.

For the best results from the biomonitoring function, you should place the notch on the underside of your finger. This is especially important for models like the Oura Ring 4 that have recessed sensors and don't emit bright, visible LED lights.

Charging alignment made easy

The notch on the Oura Ring is also a handy guide for charging. It can otherwise be a chore to figure out how to fit a smart ring properly onto the charging dock or into the case. This notch shows you how to align the ring immediately.

With the Oura Ring 4, you'll notice a matching notch on the charging dock that indicates how to place the ring. Simply align the notch on the ring with the notch on the dock.

A familiar pattern from the 2019 smart ring crash

The Oura Ring Gen 3 Heritage edition has a flat top that makes it easier to position, negating the need for a notch. While they can rotate on your figer, a notch like the one on certain Oura Rings helps ensure tracking is just as accurate.

No matter which Oura Ring you have, though, proper positioning is the best way to ensure the most accurate data collection possible. And this notch also serves as a tactile cue. If you wear the ring on your index, middle , or ring finger, the three best fingers to wear a smart ring on for the best blood flow measurement, you should be able to reach your thumb over and feel for the notch.