At first,press A and B to set the time you want.And then 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 remidn 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.