About this item Electric Foot Callus Grinder USB Feet Care Dead Skin Remover Rubbing Exfoliator Device Tool Feature: Applications: Remove calluses, massage feet, feet, heel grinding cuticle Easy to hold Fast loading Two diamond grindstones Convenient cleaning Specifications: Power supply: USB plug-in or 4 * AAA dry batteries (note: please make sure the battery is not placed when plug-in, otherwise the machine will be damaged, and the product does not contain batteries)