Electric Foot File Callus Remover Professional Foot File Pedicure Tools Adjustable Speed 120pcs Replacement Sandpaper disc Easy to Remove Cutin Dead Skin calluses(Black 120pcs): electric foot callus remover doesn't use batteries, no need to worry about low battery, when you want to use it, plug it directly into the outlet and you can use it right away. : The speed of electric foot callus remover is adjustable, you can adjust the right speed to remove callus on your feet. ,the right speed is more helpful for us to control the machine to remove the dead skin, and it will not hurt the healthy skin. : Nice looking and durable,