3-in-1 functionality Clock, Alarm, Timer with visual progress bar; if it runs out of power you only need 2 x AAA batteriesno battery Efficient Time Management Tool This timer will make you feel like that the time is visible as the red disk disappears and the time disappears clearly. Sensing time allows you to study and work efficiently Easy to Set 60 minutes visual timer - You can simply set the desired countdown time by turning the setting knob clockwise and pressing down to confirm. When the red disk disappears, the time ends. Then the bell will ring to remind you that the time is up Other FunctionsThe buttons on the back and the knob on the top allow you to set the chronograph, alarm and time in sequence Multiple UsesYou can use it for various occasions, likes cooking, baking, learning or developing concentration. It will be a good helper in your life.