Simple operation, silent operation: one-button operation, just turn to set the time. Children and the elderly can easily work. No tic - tac, ideal for school, homework and other quiet activities. Time management and magnetism: countdown from 99 minutes 55 seconds to zero or stopwatch from 0 to 99: 55. There are strong magnets on the back which can be placed on any iron surface and easy to be placed on refrigerator door, microwave, etc. Colle [Ultra Clear Display] The large black display and oversized white numbers allow you to easily view the time remaining to be set. Powered by 3 AAA batteries (included). Sleep mode, always at your service! [3 volume levels] can adjust the alarm sound, center quiet (75 decibels) / high (90 decibels), you just need to hear this alarm in the other room. The voice is strong. You won't worry Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be some color difference, depending on the physical object received.