NO BATTERIES REQUIRED - Premium mechanical countdown timer for cooking, meetings, teaching, playing games, doing homework, and more! Completely mechanical-no batteries needed | A COUNTDOWN TIMER HAS MANY PRACTICAL USES - Improve time management and more! Examples: bedtime routines, setting timeouts. Excellent tool to help children understand the passage of time visually. Recommended for special education and K-12 teachers | PERFECT FOR ALL ABILITIES - The countdown clock can help those with special needs. As the time elapses, the bright blue disc disappears. The visual design aspect of this timer encourages independence and increased productivity for people | SMALLER FOOTPRINT WITH MULTIPLE PLACEMENT OPTIONS - 1) Features powerful magnetic backing panels to place on refrigerators, whiteboards, and more! 2) It can open up for placement on flat surfaces like desks and countertops. 3) Easily wall mounted | EASY TO USE - Simply turn the control knob clockwise to expand the bright blue disk-making it easy to see the time count down visually | Note: To activate the timer before each use, turn the control knob clockwise to the 55-minute position, then turn it counterclockwise to the desired time. About 70 decibels when the bell rings