--Key A is "hour" --Key C is "minute" --Key B is "start/pause" --Press A and B to set the time you want --Press C to begin to countdown(the digits on the LCD flash). --If you press C for 2 seconds,the timer will pause(the digits on the LCD do not flash at this moment). --If you press C again , the timer will coutinue to countdown the rest time. --When the set time is up,the timer will make out "beep-beep" alarm to remind you. --When the alarm is over,press C,the timer will repeat the last setting time. --Press 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 A and B at the same time to restart setting.