--- --- Oct 09, 2025 # Oura Ring 4 Always on by [Matt Alderton](/author/matt-alderton/) ## Matt Alderton  Courtesy Oura The latest smart ring from the Finnish company that pioneered the category has more than twice as many signal pathways as its predecessor, enabling more complete and accurate readings of physiological data. The ring [introduces](https://time.com/collections/time100-companies-2025/7289650/oura/ "undefined") Oura’s “smart sensing” technology, which captures blood oxygen levels, heart and respiratory rates, skin temperature changes, and movement. In December 2024, two months after launching [Oura](http://ouraring.com/ "undefined") 4, the company introduced its subscription-based Symptom Radar, which identifies early signs in a user’s biometric data of common respiratory infections like the flu or a cold. **Buy Now:** Oura Ring 4 on [Amazon](https://amzn.to/4oetbhq "undefined") _Disclosure: Investors in Oura include_ TIME _owner and co-chair Marc Benioff._ These are independent reviews of the products mentioned, but TIME receives a commission when purchases are made through affiliate links at no additional cost to the purchaser. Oura Ring 4: The Best Inventions of 2025 ```json [{"@context":"https://schema.org","@type":"Article","@id":"https://time.com/collections/best-inventions-2025/7318554/oura-ring-4/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/collections/best-inventions-2025/7318554/oura-ring-4/"},"headline":"Oura Ring 4","datePublished":"2025-10-09T11:00:17.000Z","dateModified":"2026-04-13T11:55:11.995Z","description":"","url":"https://time.com/collections/best-inventions-2025/7318554/oura-ring-4/","keywords":["Tech","E-Commerce","list","franchise","Magazine","best inventions","Special Project","sponsorshipblock","Accolades","Best Inventions 2025"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt3c3d1d2cfa192ea9/6998ca41c8dcb4763eb50852/oura-ring-4-TIME-best-inventions-2025.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Matt Alderton","jobTitle":null,"url":"https://time.com/author/matt-alderton/"}],"creator":"Matt Alderton","articleSection":"Business","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt3c3d1d2cfa192ea9/6998ca41c8dcb4763eb50852/oura-ring-4-TIME-best-inventions-2025.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/business/","name":"Business"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/time-section-tech/","name":"Tech"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/collections/best-inventions-2025/7318554/oura-ring-4/","name":"Oura Ring 4"}}]}] ```