Black LED digital display adjustment - magnetic suction fixation Easy to use, intelligent and energy-saving One click operation, very simple, easy for both grandma and 5-year-old children to use. Silicone knob and black body, just rotate the knob to set the time, press to start or stop. The digital light will dim in 5 seconds and turn off in another 5 seconds to continue using the battery. [Magnetism and Time Management] With magnetism on the back, you can attach it to classroom whiteboards, cookware, tasks, student tablets, iron walls, refrigerators, gyms, or other steel facilities. Helping students focus on learning, time management for showers, games, etc., classroom teacher organization, mother cooking, baking, and boiling eggs, as well as helping individuals with autism hyperactivity disorder alleviate transitions, encouraging independence and productivity in all abilities. Large LED display screen and constant brightness function: 3-inch large screen with constant brightness function. Constantly bright numbers make long-distance reading easier. Even in large conference rooms, classrooms, kitchens, and gyms. Loud alarm and digital flashing function Three level alarm sound mode, which can be silent, normal, or up to 90db. There will be no unnecessary beeps when setting the timer. You can hear this alarm in the other room, so there's no need to worry about overcooking anymore. In silent mode, the flashing number will remind you when to arrive.