INSTRUCTION! This electric foot file callus remover are not rechargeable and not include in the set batteries AA! Before operate prepare 4 AA batteries. Open the battery compartment and attentively check polarity of battery placement. Insert battery according to the polarity PLUS (convex side) TO MINUS (flat side). After installation batteries close the battery compartment and turn ring supply clockwise to the I position (ring supply located over the handle). After using switch off power ring supply to the position " ".Replaceable Roller: The heel scraper for cracked heels is designed for convinient foot care, the roller is quick & easy to replace. The foot sander callus remover efficiently removes dead skinEasy to Clean: Press the release button on this foot scrubber dead skin remover to remove the roller for cleaning. The foot shaver callus remover ensures a hygienic pedicure at homeSuitable for All Skin Types: This pumice stone for feet glides effortlessly, requiring no pressure for smooth results. The callus shaver for feet is designed for men and womenPractical & Thoughtful Gift: This foot callus remover tool makes at-home pedicures effortless. The foot grinder callus remover heavy duty is a practical gift for women or men