Oura Ring 4 ( Basic Model ) & Membership

2026-11-03

Design and Materials : 1 . Exterior Material : Fully titanium design , unless alternative options are offered at the exact same price . 2 . Inner Shell Material : Non - allergenic , medical - grade , BPA - free titanium inner shell . 3 . Sensor Placement : Recessed interior sensors ( approximately 0 . 3 mm ). 4 . Available Finishes : Black or Silver finishes , in any combination . 5 . Dimensions : o Width : 7 . 9 mm o Thickness : Approximately 2 . 88 mm o Weight : 3 . 3 – 5 . 2 grams ( depending on ring size ) 6 . Sizing : Rings must be available in sizes 4 – 15 . 7 . Sizing Kit : Oura Ring 4 sizing differs from previous generations and requires white ring sizers . Sensing Technology and Connectivity : 1 . Core Technology : Must utilize Smart Sensing technology designed to deliver accurate , continuous data by adapting to the user ’ s finger structure and skin tone . 2 . Required Sensors : o Heart Rate / HRV / Respiration : Green and infrared PPG sensors capable of alternating to measure 24 / 7 heart rate , heart rate variability , and respiration rate during sleep . o Blood Oxygen : Red and infrared LEDs capable of measuring blood oxygen ( SpO₂ ) during sleep . o Temperature : Digital temperature sensor capable of measuring average body temperature variations . o Activity : Accelerometer capable of tracking movement and activity 24 / 7 . 3 . Connectivity : Bluetooth Low Energy ( Bluetooth Smart ®). Must be EMF - safe and support Airplane Mode .

Kansas

2026-04-08