It’s the lightweight titanium smart ring worn on the finger to continuously track over 50 health metrics, including sleep, heart rate, heart rate variability (HRV), body temperature, and activity.

And these days, Oura Ring boasts millions of fans around the world.

Right now, in honour of Amazon Prime Big Deal Days, you can get your hands on the Oura Ring 4 for $359 instead of $649.

Know the news with the 7NEWS app: Download today

That’s a saving of 45 per cent, meaning it’s nearly half price.

The Oura Ring 4 — available in gold, black, brushed silver and stealth — is powered by Smart Sensing, which adapts to you — delivering accurate, continuous data, day and night.

With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present.

Right now, in honour of Amazon Prime Big Deal Days, you can get your hands on the Oura Ring 4 for $359 instead of $649. Credit: Amazon Australia

From a workout to a night out — you’re free to forget it’s on. Until you start getting compliments.

While the Oura Ring 5 is now available, the updated design of the Oura Ring 4 is more comfortable, fits better than ever, and it’s water-resistant.

It tracks over 30 biometrics, including sleep, activity, stress, heart health, and women’s health metrics.

While you’ll need membership in order to fully avail of the Oura Ring’s many features, included with your purchase is the first month free.

From a workout to a night out — you’re free to forget it’s on. Until you start getting compliments. Credit: Amazon Australia

Those who have invested in the Oura Ring 4 have raved about it.

“I’ve only used it for a week so I haven’t gotten the full insights it can offer, but the Oura ring 4 has been great so far. I bought it primarily to track my sleep, and it’s fascinating to track the quality of my sleep each night,” writes one happy shopper.

“Love this ring, beautiful, fits amazing, and the data that you learn over the days, weeks, months of wearing is amazing,” adds another.

A third says: “Completely addictive, so interesting in terms of the info — I’m debating moving away from my Apple Watch as the battery on this is so much better — I always charge my watch overnight but the sleep info on the Oura is great, amazing accuracy on the patterns!”

For more information and to shop the Oura Ring 4 for yourself, head here now.

Prices are correct at the time of publication.

What is Amazon Prime Big Deal Days?

Amazon Prime Big Deal Days is Amazon’s major fall shopping event designed exclusively for Prime members, offering deep discounts across dozens of categories ahead of the holiday season.

Often referred to as “Autumn Prime Day”, the event serves as a kickoff for holiday shopping, similar to the summer Prime Day event.

It comes as a precursor to Black Friday and Cyber Monday discount periods.

Discounts span more than 35 categories, including consumer tech, Amazon devices (Kindle, Echo, Fire TV), fashion, beauty, home and kitchen goods, and toys.

Major participating brands include Shark, Sony, Lego, Dyson, KitchenAid, and more.