About this item

• SIZE BEFORE YOU BUY – Oura Ring sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit.
• OURA MEMBERSHIP – First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Or opt for the annual prepaid option for 69.99. Membership is tied to your account via the Oura App, not your physical ring
• ACCURACY – SMART SENSING – Oura tracks over 50 health metrics, including sleep, activity, stress, heart health, metabolic health,and women’s health metrics. Smart Sensing technology adapts to you — delivering accurate, continuous data, day and night
• LONG LASTING BATTERY – With 5 to 8 days of battery life, no screens and no vibrations, Oura Ring 4 Ceramic 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 – Thoughtfully crafted in high-performance zirconia ceramic, Oura Ring 4 Ceramic combines refined elegance with everyday durability. The updated design is comfortable and is water resistant.
  

  Operating system	Proprietary (Oura OS)
  Memory storage capacity	16 MB
  Special feature	Sleep tracking, heart rate monitoring, stress tracking, women’s health index
  Battery capacity	21
  Connectivity technology	Bluetooth
  Wireless communication standard	Bluetooth
  Battery cell composition	Lithium Polymer
  GPS	No GPS
  Shape	Round
  Brand	OURA

  Additional details

  Operating System	Proprietary (Oura OS)
  Product Features	Sleep tracking, heart rate monitoring, stress tracking, women’s health index
  GPS Geotagging Functionality	No GPS
  Band Material Type	Ceramic
  Case Material Type	Titanium
  Water Resistance Level	Water Resistant
  Sport Type	Multi-Sports
  Human Interface Input	Unknown
  Supported Application	Fitness Tracker
  Water Resistance Depth	100 Metres
  Supported Satellite Navigation System	GPS
  Controller Type	Proprietary
  Metrics Measured	Blood Oxygen (SpO2), Heart Rate, Sleep Duration, Stress
  Closure Type	None (continuous ring)

  Style

  Shape	Round
  Style Name	Minimalist
  Colour	Midnight
  Band Colour	Midnight

  Connectivity

  Connectivity Technology	Bluetooth
  Wireless Compability	Bluetooth
  Wireless Provider	Unlocked
  Communication Feature	Bluetooth

  Measurements

  Item Weight	5 Grams
  Item Dimensions	8 x 8 x 4 millimetres

  Item details

  Brand Name	OURA
  Model Name	Oura Ring 4 Ceramic Midnight – Size 12
  Target Audience	Unisex Adults
  Age Range Description	Adult
  Model Number	JZ90-57455-12
  Box Contents	Oura Ring 4 Ceramic, Oura Ring 4 Charger, USB Cable
  Product Warranty	3 year manufacturer warranty
  Wearable Computer Type	Smart Ring
  Unit Count	1.0 count
  Manufacturer	Oura

  Battery

  Battery Capacity	21
  Battery Cell Type	Lithium Polymer
  Battery Average Life	8 days

  Display

  Display Type	No Display

  Compatibility

  Compatible Devices	Smartphone, Tablet
  Compatible Phone Models	Android Devices, iOS Devices

  Memory & Storage

  Memory Storage Capacity	16 MB

  User guide

  Warranty Type	Limited

  Warranty & Support

   5-Years Warranty