TimerQ function is so simple, but practical enough, and after all, it's such lightweight (only 72 KB after decompression), isn't it? You don't need to install, after running TimerQ automatically hides itself into the system tray, by right-clicking the icon you can choose the preset time to countdown.

You can choose the "Set Custom Timer" to custom the reminder time, or else choose 3, 5, 10, 15, 20, 30 minutes to start to countdown immediately. At the set time, TimerQ will pop up a small dialog to prompt your time has come, such as "Your 3 minutes are up" or any word you like.

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