Oura Ring 4 Black (Includes Free Size Kit)
Choosing the right Oura Ring size is essential for comfort and accurate readings.
After placing your order, our team will ship out the free size kit to your address. Simply contact us on WhatsApp. once you confirm your preferred size, we will ship the product within 15 days. this part of the process is complimentary free of charge.
The Oura Ring 4 Black is a powerful wearable technology for comprehensive health tracking. This sleek black smart ring accurately monitors sleep activity heart rate and body temperature offering personalized insights to optimize your wellness journey. Its minimalist design ensures comfortable and discreet daily wear making it the ultimate health companion.
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
In the Box
- Oura Ring 4
- Size-specific charger
- USB-C cable