- Electrical callus management device - High speed rotation of 4000 rpm - General battery used(AA size) - No stimulus to the skin, only removes the callus.   Main body/switch/battery cover/nozzle protection cap/circular nozzle/cone nozzle/cap/cleaning brush - This product uses two AA alkaline batteries. - This product operates at both high and low speeds. - Circular nozzle: Used to treat the hard skins on your foot bottom, side and heel. - Cone nozzle: Used to treat fine areas of your foot. - Using a circular nozzle, you can soften the areas. - If use on a certain area for too long, it can cause heats by friction forces. - Prior to use, do not apply moisture cream. But check if the target area is dtry and clean first. - Do not use it on a soft skin but instead use it intensely on hard skins.