Fangrui Product Details Made Of High-quality Material, No Need To Buttons Repeatedly When You Need The Standard 1, 5, 10, 25, 30, 60 Minutes. You Can Also Set Preset Times According To Your Personal Needs. (2 X Aaa Batteries Not Included) This Timer Is Versatile And For A Variety Of Situations, Including The Office, Work, Meetings, Tasks, Studying, Reading, Exercising, Cooking And Countless Other Scenarios. In Fact, You Can Use This Timer In Almost Any Situation You Can Think Of! Start Recording Time, With The Screen Facing Up, Slide The Switch To Silent Mode Or Ring Mode, The Screen Light Up. Then Wait 5 Seconds To Flip It Over And Start Recording Your Time. If The Preset Time On The Productivity Timer Isnt What You Want, You Can M+ Or M- To Increase Or Decrease The Minutes. Minute Adjustment Be Unavailable 5 Seconds After The Countdown Begins. Silent And Ring Mode, When Working Or Reading In Public Places, A Flashing Notification On The Lcd Screen Lets You Know The Time Is Up, But In Silent Mode It Not Disturb Others