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3 inch large led screen with clear numbers make the time easy to read at a long distance, even in big classroom, meeting room. twist the knob to set time from 00:00 to 99:59. the digital light will be darken in 5 seconds and shutdown in another 5 seconds to save battery life. the timer can firmly stick to any metal surface like refrigerator for its" built-in strong magnets. there are 3 levels of alarm sounds from silence up to 95db. you can hear the loud alarm in another room. the timer is suitable for cooking, exercising, meeting, doing homework, teaching, baking, gaming, and so on..syi