The Automatic Nail File by Miles Kimball is designed to help those with limited dexterity trim and smooth their nails effortlessly. Its easy-grip handle ensures comfortable use. This file features two-speed operation, a storage cap, and two rotary-action emery heads - one small for fingernails and one large for toenails. The automatic nail file requires 2 AA batteries (not included) and measures 7 inches long.