Main Features M4 Smart Band Fitness Tracker Watch1. Made Of High-Quality Materials, Comfortable To Wear, No Binding, Color Display, Clearer.n It Has Many Functions Such As Health Detection, Monitoring more→Sleep, Information Prompting, And Waterproofing.Power On Long Press Function KeyFeatures *Sports And Health Sports Step (3D Sensor), Calorie Consumption, Exercise Distance, Pedometer *Support Dynamic Heart Rate, Blood Pressure, Blood Oxygen Monitoring, *Support Call Reminder And Message Reminder *Remote Camera Function Shake It To Take Photos After Bluetooth Connection Like A Remote Camera Shutter For Your Phone. *Life Waterproof Ip67 ,Can Wash Hands, Wear In The Rain, But It Better Not