Time Management---Countdown cooking timer improves time management, increases productivity in daily tasks, and helps children visualize the passage of time. Visual Design---Size: Approx. 6x3.7cm / 2.4x1.5in. Countdown cooking timer features a visual design that helps simplify transitions, with brightly colored discs that disappear as time passes. Magnetic Backplate---Kitchen timer has a strong magnetic backing, perfect for placement in refrigerators, ovens, utility cabinets, classroom whiteboards and more. Easy To Use---To activate the timer before each use, turn the control knob clockwise to the 55 minute position, then counterclockwise to the desired time. Scope Of Application---Stainless steel visual timer is highly accurate for school classrooms, office work, kitchen cooking, gym workouts, etc. No batteries required.