Extremely Easy to Use: Simply turn the knob to adjust the time. Turn it clockwise to increase time and counterclockwise to decrease it. If you want to turn off the ringer, just turn it clockwise slightly and then back to zero. Non-Ticking & Adjustable Alarm: Thanks to the sophisticated internal structure, there is almost no sound while running. You can concentrate on your work without any distractions. The alarm volume can be adjusted to active/inactive, and the ringing time can be adjusted to 3 seconds/60 seconds. Interesting Pattern Design: visual timer is a perfect timer for classroom or as a kitchen timer for cooking. Rainbow pattern design stimulates children's interestand facilitates the completion of assigned tasks. Practical Ways to Improve Efficiency: The passage of time is visible, like an hourglass, making it easy to understand for people of any age. Unlike a digital timer, you don't need to look at numbers, just glance at the countdown timer to know how much time is left. Suitable for Several Occasions: This pomodoro timer is not only suitable for classroom and kitchen, but also for beauty, yoga, work, exercise, group games, or managing entertainment time.