operation instruction: key a is hour, key b is hunite, key c is start/pause. at first,press a and b to set the time you want. and press key c to begin to countdown (the digits on the lcd flash). if you press c for2 second, the timer will pause (the digitson the lcd do not flash at this moment). if you press key c again, the timer will continue to countdown the remained time. when the set time is up, the timer will give out the alarm of beep-beep to remind the user. when the alarm is over, pressing key c will cause the timer to restart timing per the last satting. press key a and b at the same time, the last setting is cancelled. the time can be reset. if you can not set hours or minutes, please press key a and b at the same time to restart setting.