Oura Ring 4 Size 7

Oura Ring is preowned and in excellent condition comes with instructions brouchore and charger. Please view images for more on rings condition.



Quality Materials


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



Sensors


Red and infrared LEDs measure blood oxygen levels while you sleep
Green and infrared LEDs alternate to measure heart rate and heart rate variability 24/7 and respiration rate during your sleep
Digital sensor measures your temperature variations
Accelerometer tracks movement and activity 24/7



Battery Life


Up to 8 days of battery *
Typically charges in 20-80 minutes, depending on battery level



Weight and Dimensions


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



Compatibility


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



Connectivity


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