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.

Compact Timer is one small but powerful, multi-function and multi-tasking timer, it can not only count down, but also can count up, and can be regarded as a reminder or stopwatch.