Can countdown as low as 5 minutes, or as high as 24 hours. Includeds 3 two-sided timer faces - 5/15 minutes, 30/60 minutes, 120 minutes/Dry Erase Board timer face allowing for maximum flexibility and customization, in addition to - set markers. Has Silent, Moderate, or Loud alert sound levels. Can be used on a flat surface, hung on a wall, whiteboard, or map rail. 1 bracket mount is included. Requires 2 C batteries (not included). Measures 17" x 17".