If you’ve been waiting for a smaller version of the Oura Ring, the company’s latest wearable is now available for preorder ahead of its June 4th release from Oura and various third-party retailers, including both Amazon and Walmart. The Oura Ring 5, which starts at $399, is 40 percent smaller than its predecessor, thanks to a design that’s both slimmer and lighter. Oura also promises improved accuracy and battery life, letting you get up to nine days of use on a single charge.

In addition to the aforementioned hardware changes, Oura is rolling out several new software features, including a Locate tool for finding a misplaced ring or charging case using Oura’s app. On the fitness front, the company is introducing a live activity mode for real-time workout and heart rate tracking, along with support for third-party heart rate monitors and new GLP-1 tracking tools. Oura also announced Health Radar, a system that monitors nighttime breathing and blood pressure patterns for signs of potential health issues, and partnered with Counsel Health to bring AI-assisted medical guidance to the app.

We’re still testing the Ring 5, but if everything announced thus far has your attention, we’ve included links and pricing details below.

Where to buy the Oura Ring 5

Beginning today, you can preorder the Ring 5 at Amazon, Best Buy, Target, Walmart, and Oura’s online storefront in either silver or black, starting at $399. Premium colors — including the gold, stealth, brushed silver, and deep rose variants — are also available from the same retailers starting at $499. Each model includes a size-specific charger and a USB-C cable, and, like prior iterations, is eligible for HSA and FSA reimbursement in the US.

In terms of sizing, Oura’s latest smart ring is available in sizes 6 through 13 with a free sizing kit, which is helpful since the slimmer design means sizing differs from previous Oura Ring models. Like prior iterations, the ring works with both iPhones and Android devices, though you’ll still need an Oura membership ($5.99 a month / $69.99 a year) to access all of the platform’s health insights and features.

Along with the ring, Oura is launching the Oura Ring 5 Charging Case, which supports wireless charging and can provide up to a month of battery life. It also sports an action button that lets you quickly pair the case and check charging status. Like the Ring 5, the case will hit stores on June 4th, though you can preorder it starting today at Amazon, Best Buy, Target, and Oura’s online storefront for $99.