The Liberty 351 Bull Dog® shoe brush machine (motorized shoe brush cleaner) is specifically designed to clean shoes where employees or visitors enter your office, warehouse, or work area directly from outside or a dirty work area. This unit handles all types of dirt including mud, leaves, grass clippings, slush or sand. Measuring 16" (w) x 21" (l) x 44" (h) and weighing 135 lbs, this puppy is ideal for heavy industrial areas. 120 volt/60 HZ.