Specifications Hign-concerned Chemical:None Waterproof Grade:5ATM Model Number:SR08 Display screen:Yes Activity Tracked:Steps Tracker Metrics measured:Sleep Monitor Item Weight:3.4g Case Material:STEEL Certification:ce Brand Name:SIMSONLAB Battery Capacity(mAh):18mah APP:JRing Smart ring for man:Smart ring for Woman Smart ring for Xiaomi:Smart ring for Huawei Smart ring for Samsung:Smart ring for IOS Operation:Ring touch 1.Touch to display the current synchronization time 2.Double-touch and the green step light will light upand display the actual number of steps. 3.Touch four times and the red heart rate lightwill light up and the words SOP2 will be displayed. After 0.6seconds, the blood oxygen test state will be switched and thethree middle bars will rotate. After the test, the test result willbe displayed. 4.Touch five times to display the word SLEEP, and after0.6 seconds, the sleep duration of last night will be displayed. 5.Touch six times to display the current batterylevel, the same as when charging. Functions 1.Gesture swipe video:Built-in motion gesture function, please wear the ring. Quickly double-click with your finger: switch videos. 2.Gesture wave Take photos instantly:A new level of selfie, trigger the beautiful smart ring with one finger, remotely control the photo, allowing you to easily become your own professional photographer. 3.5 ATM waterproof technology:Fully enclosed structure,daily waterproofing is easy to handle, support swimming, washing hands, bathing, showering, etc., to meet your various waterproof needs. 4.Ultra-long battery life:The single battery life is about 3~4 days 5.Quality Choice Powerful Attack:A new form of smart wearables adds beauty to life,durable stainless steel shell, quality touch, from the outside to the inside 6.Provides intelligent reminders and incentives to help you achieve your daily goals efficiently. Weekly statistics for the week The weekly goals are clearly visible and the exercise habits are formed. Specification Size: 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 2.5mm Color:Black,Gold,Silver APP: Jring Charging: charging box Notice 1. After receiving the ring, please charge it first, because after a long time of logistics, the watch will be low on power. 2.The data of the health test function is for reference only, and the specific health data should be based on medical data. 3.The quick charger is not suitable for this productdon't charge with a high-power charger. 4.Before using, pleases can the QR code on the manual to download the APP and use the APP to connect with the ring.