Oura Ring 4
Quick details
Released
2024-10
Dimensions
7.9 mm wide x approximately 2.88 mm thick
Operating system
Proprietary embedded firmware
Display Screenless
Battery life 5-8 days
Water resistance 100 m
GPS No
Sensors Red, green and infrared LEDs, 3 photodetectors, temperature sensor, accelerometer
Technical specifications
General
Release date 2024-10-03
Product type Smart ring
Physical size 7.9 mm wide x approximately 2.88 mm thick
Weight 3.3-5.2 g depending on size
Material Titanium exterior and titanium interior; PVD or DLC coating depending on finish
Water resistance 100 m / 328 ft
Color options Black, Brushed Silver, Gold, Rose Gold, Silver, Stealth
Display type None (screenless)
Display size None
Display resolution None
Display brightness None
Display protection None
Battery Rechargeable internal lithium-polymer battery
Battery life Typically 5-8 days
Charging Size-specific aluminum charging dock; USB-C
Charging time Typically 20-80 minutes
Sensors
GNSS type None
GPS No
GALILEO No
GLONASS No
Beidou No
Accelerometer Yes
Barometric altimeter No
Compass No
Geomagnetic No
Ambient light sensor No
Optical heart rate Yes (Smart Sensing multi-wavelength PPG)
Electrical heart rate No
SpO2 Yes
Temperature Yes
Galvanic skin response No
Microphone No
Speakers No
Vibration motor No
Health & activity tracking
Steps Yes
Distance Yes (activity estimates and connected-phone data where supported)
Calories burned Yes
Floors No
Sports tracking Automatic Activity Detection and activity heart-rate tracking
Sleep Yes
Heart rate Yes (24/7)
HRV Yes
Stress Yes (Daytime Stress)
Blood oxygen Yes
Respiration rate Yes
Skin temperature Yes
ECG No
Blood pressure No
Body composition No
Glucose No direct glucose sensor
Hydration level No
UV exposure No
Calorie intake No
Daily smart features
Smartphone compatibility Oura App on iOS and Android
Operating system at launch Proprietary embedded firmware
Storage Up to 7 days of data without syncing
Bluetooth Bluetooth Low Energy
Wi-Fi No
NFC / connected pay No
UWB No
Cellular No
Smartphone notifications No on-ring notifications
Bluetooth calling No
Smartphone music control No
On-board music storage No
Voice assistant No
Links
These technical specs are correct to the best of our knowledge at the time of publishing.
