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SpecificationOLED Screen size: 0.96inchBattery capacity: 120mAhBluetooth version: BT4.0Waterproof: IP68, support swingMaterial: Silica and plasticBattery type: Polymer lithium batterSystem Requirements: Android 4.4 and above, iOS 8.0 and above, Bluetooth 4.0FeaturesHeart rate monitoring: Automatically measures the current heart rate at every second.Sports record: Automatically records the number of steps.Sedentary reminder: let will feel with the body movement, it will e to remind you every half an hour when you sedentary.Time mode: Display time ,battery, date, current heart rate.Sleep monitoring: preure , Automatically recog nizes your status and monitors the whole sleep progre with yzing the deep sleep and light sleep hours.Call reminder: Open “call reminder”function in APP, the let will e when the phone rings.Meage reminder: Open “Meage reminder”function in APP, it will gently e to remind you when the phone come a new meage(SMS,QQ,Wechat,,Twitter).Package List1 x Smart let1 x Box