U Fit app is your ultimate fitness companion. Pair your Heart Rate Activity Tracker to the U Fit app and let your fitness journey begin with all stunning features. Features include: Distance, Steps and Calorie Counter - So you can keep track of all the action you're getting! Heart Rate Activity Tracker – So you can monitor your exercise intensity from time to time. Sleep Monitor – So you can check your sleeping quality. Sedentary Reminder - To remind you to be active! Call notifications –