The Time Timer MAX visual countdown timer is 17 inches so that you can display it in larger spaces such as gymnasiums, cafeterias, auditoriums, and large meeting rooms. It's also eight timers in one – with customizable durations and changeable timer faces, the MAX can countdown as low as 5 minutes or as high as 24 hours. The Time Timer MAX includes 3 double-sided timer faces – 5/15 minutes, 30/60 minutes, and 120 minutes/Dry Erase Board timer face – allowing maximum flexibility and customization. Create time blocks on any face using the three colored time-dividing set markers by snapping them into the grooves between the red disk and numbers. Use your Time Timer MAX on a flat surface or hang it on a wall, whiteboard, or map rail. One bracket mount is included.