viohead Smart Ring - 8

Health Rings for Women Men, Fitness Sleep Health Tracker Rings for Sleep Tracker/Heart Rate/Blood Oxygen/Steps/Distance/Calories, IP68 Waterproof Smart Ring for iphone & Android  PACKING: Smart Ring*1 Charging Box*1 Instruction Manual*1  PRODUCT DESCRIPTION: Water Proof：IP68 Size：# 6(16.5 mm) # 7(17.4 mm) # 8(18.2 mm) # 9(19.0 mm) # 10(19.9 mm) # 11(20.7 mm) # 12(21.5 mm) # 13(22.3 mm) thickness 2.8mm Battery Capacity：17.5 mah Charging time：Two hours Theory Standby time：10-15 days Normal using time：7-9 days Charging：charging box Multisports：Multiple movement modes Heart rate：App initiates heart rate test/whole day dynamic heart ratetrend and data analysis/heart rate data analysis/recent 7heart rate measurement trend/heart rate history data Sleep：Sleep statistics, sleep proportion, sleep score, sleep analysis, average sleep heart rate and so on Blood oxygen：App initiates oximetry test 7 times oximetry data 7 times,Oxygenation trend oximetry historical data Please contact with us if you encounter any problems during use, we will surely provide satisfactory after-sales service.