R09M Health Monitoring Smart Ring Multifunctional Bluetooth Smart Finger Ring - Black or Size 20 NORDIC NRF52832 chipset,multiple sensors running in sync for strong performance IP68 waterproof and dustproof,no worries about daily use New sleep staging algorithm to monitor key health data: blood pressure,heart rate,to determine the state of sleep: light sleep,wakefulness,deep sleep,and analyze the quality of sleep By tracking your heart rate,you can understand what your physical state is like during the day,during exercise,and during relaxation,and you can promptly check your physical condition in advance when your heartbeat is irregular or too rapid or too slow Monitor your heart rate anytime,anywhere. Open the app to view the heart rate data for the corresponding time period Specifications: Ring inner diameter: Size 18: 17.8mm,Size 20: 19.8mm,Size 22: 21.8mm Chipset: NRF52832 APP: Smart Health Compatible System: Android 6.0 (inclusive) and above,IOS11.0 (inclusive) and above RAM Memory: 64KB FLASH Memory: 4Mb Screen: no Encoder: not supported Touch: not supported BT: 5.2 low-power Bluetooth chip Bluetooth call: not supported WIFI: not supported NFC: not supported Accelerometer: STK8321-W Gyroscope: not supported Heart Rate Sensor: HX3605 GPS: not supported Battery Type: Polymer Li-ion Battery Capacity: 18mAh Charging Method: Magnetic Charging APP Smart Health function: Steps,kilometers,calories,exercise data recording Heart rate measurement,blood oxygen measurement,blood pressure measurement,Sleep health monitoring Multiple sports modes,running,cycling,skipping,fitness,mountaineering,yoga,golf,dance Supported languages: English,Simplified Chinese,Traditional Chinese,Russian,Ukrainian,German,French,Italian,Spanish,Portuguese,Polish,Greek,Romanian,Hungarian,Czech,Slovak,Irish,Croatian,Swedish,Danish,Finnish,Arabic,Persian,Norwegian,Japanese,Korean,Thai,Vietnamese Waterproof Level: IP68 Charging time: about 1-2 hours Life time: 5-10 days of use,15-20 days of standby Appearance material: resin and stainless steel Package included: 1 x Smart Ring 1 x Charging Cable 1 x English User Manual