Not battery powered - no need to charge, just plug it in and use it right away, no need to worry about low battery Equipped with gear transmission - this electric foot file has speed transmission, you can adjust different speeds to meet your needs, will not harm healthy skin, more convenient. Replaceable sandpaper block - self- adhesive, you can easily stick on the machine and remove it, one person, one disc, safer, perfect for family use in nail salon. Powerful motor - adjust suitable speed, then we need to give the machine proper pressure (not too much), the machine will easily remove dead skin from the foot, dry skin. Stylish appearance - aluminum alloy shell and beautiful glossy finish, as a small flashlight, easy to carry when traveling or on vacation.