Tracking steps, distance, calories, activity level and sleep efficiency. Recognizes upstairs and downstairs, which may consume different calories from walk. BLE compatible to a smartphone and sync with apps; Smart View: auto screen activation by arm movement and posture when you see it, without any button operating; waterproof: for raining, showering, swimming; Auto Mode shifting: by algorithm recognition between stepping, sleeping and driving; Message Notification from iPhone; Intelligent Vibration Alarm for wakeup or lack of activity: gently on your wrist without bother others.