Best for
Continuous passive health surveillance, autonomic nervous system recovery tracking, and circadian sleep optimization without screen distractions.
Oura Health
Oura Ring 4
Medical-grade all-titanium smart ring with Smart Sensing recessed photoplethysmography, continuous HRV, and clinical sleep staging.
From $349.00
USD is authoritative · crypto amount locks at invoice creation
Verified selection · 24-month warranty
25 available
Why we selected it
Authentic sealed hardware with validated manufacturer cryptographic serial.
Privacy considerations
Zero microphones, cameras, or unencrypted local beacons. Hardware-level pairing encryption with secure cloud synchronization.
Shipping & warranty
Dispatched in discreet protective packaging with sizing kit confirmation.
Specifications
ConnectivityBluetooth Low Energy (BLE) with AES-128 encrypted communication
Sensor Matrix18 multi-pathway Smart Sensing PPG channels (green, red, infrared LEDs)
Sleep StagingPolysomnography (PSG) 4-stage validated algorithm (Deep, REM, Light, Awake)
Water Resistance100 meters (10 ATM / ISO 22810 standard)
Battery & ChargingUp to 8 days operational battery life; wireless induction dock (20-80 min full charge)
Biometric TrackingContinuous nocturnal HRV (rMSSD), resting heart rate, SpO2 (blood oxygen saturation)
Temperature SensingNegative Temperature Coefficient (NTC) thermistor array (0.1°C relative resolution)
Material ArchitectureFull Grade 5 titanium exterior and non-allergenic seamless titanium interior casing
Supporting documents
No additional documents are required for this product.
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