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This timer help you in your presentation. You only need to set the time of the announcement, and preliminary 5 minutes before the alarm, sound the alarm end time. Let me know in the blink of the screen as well.
Time setting is just tap the number on the screen. Increase and decrease I tap the top of the figure, and then tap the bottom. 30 minutes and 15 minutes were dedicated to provide a button directly. Then just press the start button to set the time. Please double-tap the screen if you stop the timer.