Oura Ring 4 Black

Key Features:

SIZE BEFORE YOU BUY - Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit.
OURA MEMBERSHIP - First month of membership is free with your purchase, $6.99/mo afterwards. Offer available to new members only. Or opt for the annual prepaid option for $79.99. Membership is tied to your account via the Oura App, not your physical ring.
ACCURACY - SMART SENSING - Oura tracks over 30 biometrics, including sleep, activity, stress, heart health, and women’s health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you — delivering accurate, continuous data, day and night.
LONG LASTING BATTERY - With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. From a workout to a night out — you’re free to forget it’s on. Until you start getting compliments.
DESIGNED FOR 24/7 WEAR - The updated design of the Oura Ring 4 is more comfortable, fits better than ever, and is water resistant. The first all-titanium smart ring combines exceptional durability with a gentle touch, even for sensitive skin.

Product Specifications:

Sensors

• Red and infrared LEDs measure blood oxygen levels
• Green and infrared LEDs alternate to measure heart rate and heart rate variability 24/7 and respiration rate
• Digital sensor measures temperature trends
• Accelerometer tracks movement and activity 24/7

Compatibility

• Oura App is available in English, Finnish, Japanese, German, French, Spanish, Italian, Norwegian, Swedish, Czech, Dutch, and Danish
• Supports metric and imperial units of measurement
• Integrates with 40+ apps
• Available on iOS and Android

Weight and Dimensions

• Width: 7.90mm
• Thickness: 2.88mm (similar to a wedding band)
• Weight: 3.3 to 5.2 grams (depending on Oura Ring size)

Battery Life

• 5-8 days of battery life*
• Typically charges in 20-80 minutes, depending on battery level

Quality Materials

• Non-allergenic titanium on inner & outer surfaces
• Seamless titanium interior
• Water resistant up to 100m/328 ft
• Minor scratches from regular wear are normal

Connectivity

• Bluetooth Low Energy
• Automatic firmware updates via Oura App
• EMF-safe
• Supports airplane mode
• FCC-certified