OURA JZ90-54219-08 Smart Ring Horizon Silver 3rd Gen

The OURA JZ90-54219-08 is a 3rd generation Horizon smart ring in Silver, crafted from lightweight titanium with a durable PVD coating. Designed for continuous health monitoring, it tracks heart rate, HRV, skin temperature, sleep stages, activity, and SpO2. With up to 7 days of battery life and 100m water resistance, it's perfect for everyday wear and swimming. The ring connects via Bluetooth Low Energy to the Oura App on iOS 15+ or Android 8.0+.

Advantages

Advanced sensors in a discreet, comfortable form factor. No screen distractions – just actionable health insights. Wireless charging and up to 6 weeks of offline data storage ensure seamless use.

Suitable for

• Health-conscious individuals seeking detailed sleep and recovery analysis
• Athletes and fitness enthusiasts tracking activity and readiness
• Anyone wanting a stylish, waterproof wearable for 24/7 health monitoring

Key specifications

• Product Type: Smart Ring
• Generation: 3rd Generation
• Design: Horizon (Uniform round profile)
• Color: Silver
• Material: Titanium with PVD coating
• Connectivity: Bluetooth Low Energy (BLE)
• Sensors: PPG (Green & Red LEDs), Infrared LEDs, NTC Temperature Sensors (3x), 3D Accelerometer
• Battery Life: Up to 7 days
• Charging Time: 20-80 minutes
• Water Resistance: 100 meters (330 feet)
• Compatibility: iOS 15+ / Android 8.0+
• Health Metrics: Heart Rate, HRV, Skin Temperature, Sleep Stages, Activity, SpO2
• Ring Thickness: 2.55 mm
• Ring Width: 7.9 mm
• Subscription: Required (Oura Membership)
• Data Storage: Up to 6 weeks offline
• Charging Method: Wireless (via included charger)

Recommendations

For optimal experience, pair with the Oura App and maintain an active Oura Membership. The ring is designed for daily wear; ensure proper fit by selecting the correct ring size.