This timer is made of high grade ABS. One key operation, no more struggling to set a timer with small buttons, just rotate to set time. Large black screen and white numbers allow you easily see the time remaining. Counting down from 99 minutes 55 seconds to zero, or as a stopwatch count up from 0 to 99:55. It comes with magent on the back , you can stick to classroom whiteboard , cooker,task, students tablet, iron wall, fridge and so on. Batteries not included