R8 Multi-Function Smart Ring Health Tracker with Sleep Heart Rate,Blood Oxygen Monitoring - Black/20 •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/Slow Broadcast Switching Function: Supported •Zero-Clearing of Relevant Data at Midnight: Supported •Step Accuracy: ≥95% •Sleep Detection Error: ≤1 hour •Resting Heart Rate Accuracy: ±5bpm •Dynamic Heart Rate Accuracy: ±20bpm •Blood Pressure Accuracy: ±10mmHg (average difference) •Blood Oxygen Accuracy: ±3% •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: ≤10uA •Standby Power Consumption: ≤50uA •Battery Level Display Error: ≤3% •Charging Duration (hours): 1± 0.5h •Bluetooth Transmission Strength: 0dB •Bluetooth Central Frequency Offset: ±24KHz •Bluetooth Receiver Signal Strength: ≥-50dB •Bluetooth Wireless Sensitivity: ≥-90dB •Button Life: ≥100,000 times •Average No-Reset Time: ≥200 hours •Average Failure-Free Time (MTBF): ≥1 year •Speaker Output Effect: No noise,no distortion •Operating Temperature: 0 ~ 45℃ •Storage Temperature: -10 ~ 55℃ •Operating Humidity: 5% ~ 95% (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