1、[COUNTDOWN TIMER] The digital timer supports countdown from 99 minutes and 55 seconds to zero, or as a stopwatch from zero to 99 minutes and 55 seconds. With a magnet on the back, which can be placed directly on any iron surface. 2、[ALARM AND MUTE SUPPORT] With 3 levels of alarm, from 0dB to 90dB, to meet your different needs. When it runs silently, it is suitable for classrooms, libraries and offices. It reminds you by flashing the screen. 3、[SIMPLE OPERATION] One key operation, press the ST/SP button on screen to start or stop counting, and the value will increase/decrease at a minimum unit of 5 seconds. Both the elderly and children can easily use it. 4、[METAL KNOB] The use of high quality aluminum alloy + ABS material, the smooth surface makes it easy to clean, will not hide dirt, durable to use, corrosion resistant, and long service life. 5、[2 BRIGHTNESS MODES] Normal mode, the brightness is constant; power saving mode, when there is no operation, the number will dim in 5 seconds and turn off in another 5 seconds to save battery power. 6、[LED DISPLAY] Equipped with a large 3in LED display, the black screen and white numbers form a strong contrast, which is clear and intuitive, convenient for reading, and reduces the burden on your eyes.