Battery operated electric foot file with four AA batteries (Not Included) This ergonomically sharped soft touch handle foot file is the ultimate tool in your kit for a great foot spa as it removes tough, dead skin from feet in a safe and effective manner Refillable Regular Coarse roller head, with diamond crystals, with dual speed that spins 360 degrees for quick results on thick, calloused skin these tool Foot File Callus Remover effectively buffs away your thick hard skin to reveal touchable soft, smooth feet Complement your at home foot spa experience (20 Minute Foot Mask)