The Oura Ring 4 is crafted from fully titanium, one of the strongest metals on earth, ensuring durability, lightweight comfort, and water resistance. It delivers incredibly accurate data and personalized health insights, from in-depth sleep analysis to daily activity and workout tracking, helping you balance movement and recovery.Your Readiness Score uses over 50 biometrics to indicate when to push yourself or take it easy, while heart rate monitoring and HRV tracking support cardiovascular health. The ring also identifies stress signals and tracks how your cycle affects your body, all accessible through the Oura App with a long 8-day battery life. Key Features Case Material Type Titanium Band Material Type Silicone Water Resistance Depth 100 Metres Battery Average Life 8 days Battery Charge Time 80 minutes Connectivity Technology Bluetooth, USB Compatible Devices Smartphone (iOS and Android) Metrics Measured Optical, Accelerometer, Other Sensors Display Type No Display Item Dimensions 24 x 24 x 7 mm Warranty Type Lifetime Box Contents Information Booklet, Oura Ring 4, Oura Ring 4 Charger, Quick Start Guide, USB-C Cable Highlights ✓ Compact and intelligent design for comfortable everyday wear ✓ Advanced health monitoring capabilities, including heart rate, sleep patterns, and activity tracking ✓ Long battery life with convenient wireless charging ✓ Seamless smartphone app integration for detailed health and activity analytics ✓ Available in multiple finishes and sizes for personalized style Warranty Lifetime What's in the box ✓ Information Booklet, Oura Ring 4, Oura Ring 4 Charger, Quick Start Guide, USB-C Cable Frequently asked questions .pu-faq[open]>summary .pu-faq-c{transform:rotate(180deg)} Is the Oura Ring 4 water resistant?Yes, the Oura Ring 4 is water resistant to a depth of 100 metres. What devices is the Oura Ring 4 compatible with?The ring is compatible with iOS and Android smartphones via Bluetooth. How long does the battery last on the Oura Ring 4?The battery lasts up to 8 days on a single charge and takes about 80 minutes to fully charge. Does the Oura Ring 4 come with a warranty?Yes, the Oura Ring 4 includes a lifetime warranty.