R8 Multi-Function Smart Ring Health Tracker with Sleep Heart Rate,Blood Oxygen Monitoring - White or 18 The R8 smart ring offers a wealth of health and fitness monitoring features,making it an ideal companion for those who want to stay on top of their well-being. Its long battery life ensures continuous tracking,and its accuracy in measurements provides valuable health insights. Advanced Health Monitoring: The R8 smart ring is equipped with comprehensive health monitoring features,including calorie tracking,step counting,distance measurement,and sleep monitoring from 8:00 PM to 8:00 AM (automatically extended to 12:00) Multi-Sport Modes: Enjoy a range of fitness activities with dedicated modes for running,cycling,skipping,fitness workouts,hiking,yoga,golf,and dancing,allowing you to track your performance accurately Heart Rate and Blood Pressure Monitoring: Stay informed about your heart health with real-time heart rate monitoring and precise optical blood pressure measurement Blood Oxygen Measurement: The smart ring supports accurate blood oxygen measurement,ensuring you have access to vital health data Long Battery Life: With up to 7 days of working time,60 days of standby time,and 180 days of shutdown time,the R8 offers extended battery performance for uninterrupted health monitoring Specifications: Main Control: NORDIC NRF52832-CIAA Charging Chip: SY8602 Accelerometer: QMA6100P Battery: Charging Case 400mAh,Ring 23mAh Photoelectric PPG Analog Front End (PPG AFE): HX3605 Motion Measurement: Calories,Steps,Distance Sleep Monitoring: 20:00 - 8:00 (Automatically extends to 12:00) Multiple Sports Modes: Running,Cycling,Jump Rope,Fitness,Mountaineering,Yoga,Golf,Dance Heart Rate Measurement: Supported Blood Pressure Measurement: Supported via photoplethysmography (PPG) Heart Rate Alert: Not supported Blood Oxygen Measurement: Precisely supported Blood Glucose Measurement: Not supported (electrochemical measurement) Temperature Alert: Not supported Automatic Health Monitoring: Supported Activity Information Data Storage: Supported Historical Data Storage Duration: 7 days rolling Low Battery Shutdown: Supported OTA Upgrade: Supported Automatic Recovery Function: Supported Self-Check Function: Supported Fast or Slow Broadcast Switching Function: Supported Zero-Clearing of Relevant Data at Midnight: Supported Step Accuracy: ¡Ý95 percent Sleep Detection Error: ¡Ü1 hour Resting Heart Rate Accuracy: ¡À5bpm Dynamic Heart Rate Accuracy: ¡À20bpm Blood Pressure Accuracy: ¡À10mmHg (average difference) Blood Oxygen Accuracy: ¡À3 percent ECG Signal: Suitable for dry skin,no significant noise in waveform quality Working Battery Life: 7 days Standby Battery Life: 60 days Shutdown Battery Life: 180 days Shutdown Power Consumption: ¡Ü10uA Standby Power Consumption: ¡Ü50uA Battery Level Display Error: ¡Ü3 percent Charging Duration (hours): 1¡À 0.5h Bluetooth Transmission Strength: 0dB Bluetooth Central Frequency Offset: ¡À24KHz Bluetooth Receiver Signal Strength: ¡Ý-50dB Bluetooth Wireless Sensitivity: ¡Ý-90dB Button Life: ¡Ý100,000 times Average No-Reset Time: ¡Ý200 hours Average Failure-Free Time (MTBF): ¡Ý1 year Speaker Output Effect: No noise,no distortion Operating Temperature: 0 - 45¡æ Storage Temperature: -10 - 55¡æ Operating Humidity: 5 percent - 95 percent (non-condensing) APP System Requirements: Android: 6.0 and above iOS: 11.0 and above Bluetooth Version: 5.2 Charging Voltage: 4.6 - 5.2V APP: Smart Health Package included: 1 x Smart Ring 1 x Charging Case 1 x English User Manual 1 x Lanyard 1 x Charging Cable Other items not included