Visual Friendly-- The colored disk of this visual timer disappear as time passes. It is super easy to understand for young kids and help people develop a of time. Easy to Use -- Turn the clockwise to adjust the time. To turn the timer off-simply turn back to zero. Requires batteries (Included). Silently Work -- No distracting ticking. visual timer features an orange disc making it easy for children to understand the passage of time visually. Set the tone to loud or low, and the alarm time to 3 or 60 seconds. Several Situations -- Great for classroom, home, and settings. Makes an excellent classroom timer, countdown timer, study timer, toddler timer, kids timer, silent timer, kitchen timer, timer clock, time tracker, and so on.