Oura Gen3 Heritage Silver

For the Oura Ring Gen3 size 9, the exact measurements are: width of 7.9mm, thickness of ~2.7mm for Heritage style or ~2.9mm for Horizon style, and the weight will be between 4-6 grams. The ring is made with a titanium exterior and epoxy interior, with raised interior sensor domes at 1.3mm.  Measurements powered by a fixed, static configuration of optical paths  Battery: Up to 7 days  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 7 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