(1) If you set an alarm using the alarm app and try to see how much time is left in the middle after going to bed, the screen is off due to the automatic turn off of the smartphone screen, so turn on the smartphone again, and then turn on the small digital screen on the top of the smartphone. You should look at your watch. (2) If you set an alarm time while studying and try to see the elapsed time in the middle, the screen turns off after a while due to the automatic turn off of the smartphone screen, so you have to keep turning the screen on. By the way, this alarm app does not turn off the app screen unless you turn it off on purpose. Even if you close the app for a long time and open it again, as long as the app is open, the screen does not turn off, an alarm sounds at the exact time, and whether the alarm has ended is also displayed. Therefore, you can see the large clock from time to time without turning on the app screen cumbersomely, and you can conveniently use the alarm clock and timer while viewing the remaining time and progress.