SR200 Health Monitoring Smart Ring Multifunction Waterproof Finger Ring - 22mm or Black Comfortable and lightweight wearing experience sets it apart from other smart wearable products It can monitor health situation,such as heart rate,blood oxygen,blood pressure,etc Combining fashion simplicity with elegance,both inside and outside,it is the pinnacle of both aesthetics and hardware strength The intelligent ring is equipped with the most efficient hardware to provide accurate information monitoring data It's lightweight and mini size,convenient to put into your pocket for storage Specifications: Style: 17 (inner diameter and circumference 53.4MM) 20 (inner diameter and circumference 62.8MM) 22 (inner diameter and circumference 69MM) System requirements: android5.0and or ios10.0and Main control chip: FR8016HA Bracelet memory: 512KB Bluetooth version: 5.0 Heart rate sensor: HX3605 Temperature sensor: NOVOSENSE NST112c Battery capacity: 28mAh Working standby: about 3-5 days Charging method: wireless charging (including charging compartment) Waterproof grade: IP68 Gravity sensor: MEMS msa310 Bluetooth distance: 3-5 meters APP: Google: JSRings,iSO: JSRing APP languages: English (default),Arabic,Czech,Danish,German,Spanish,Farsi,French,Italian,Japanese,Dutch,Portuguese,Romanian,Russian,Turkish,Simplified Chinese Heart rate measurement: support Blood oxygen measurement: support Blood pressure measurement (algorithm): support Multidimensional sleep monitoring: support Pedometer: support Calories: support Temperature measurement (skin temperature measurement): support Package included: 1 x Smart Ring 1 x Charging Dock Station 1 x Charging Cable 1 x English User Manual