My husband has suffered, on-and-off, for a number of years with getting calluses on the bottoms of his feet. They can be painful, uncomfortable and unsightly, making it even more difficult for him to walk, a feat that is already challenging enough for him. We just did not want to try any of those products with chemicals in them to help remove the calluses, so decided to order the Electric Callus Remover we saw listed in a Dr. Leonard's catalog. We had seen similar products, but at a much higher price. Why spend more when you can get virtually the same product for much less? It only cost $4.99 and it's very easy to use. Just press it against the area of your foot where the callus is and grind it right off in minutes. It does take four 4 batteries- AA ones-and, unfortunately, they don't come with the unit. Otherwise, the Electric Callus Remover is a good product that does a very decent job and leaves my hubby's feet looking and feeling smooth, afterwards.