just click start for a countdown timer of 10 Minutes. Try the Fullscreen button in classrooms and meetings :-) Here are some great pre-set timers ready to use. They range from a 1 second timer - up to a year timer! It's pointless - but you asked for it! :-) Remember! If the timer you want is not here -- just make ANY timer you want above. Simple! Seconds Countdown Timers: Minutes Countdown Timers: Hour Countdown Timers: Other Countdown Timers: ， no settings， A cool little 10 Minutes Timer! Simple to use，。