The callous remover & massager is powered by two "AA" batteries.(not include). Exfoliating of dead skin cell to reveal a roseate, youthful skin. Convenient and easy to use, this is by far the most time-saving you've used for smoothing the dry, rough skin on you heels. It took about five minutes to sand your extremely rough heels ta a sandal-ready state. - KIT INCLUDES: 1. Soft Brush:- help to clear up all the scruff clings on the surface. 2. Coarse Buffer:- perfect for removing tough callused skin. 3. Fine Buffer:- use for final smoothing or for shaping nails. 4. Crude Polish Accessories:- to rip the tough skin and cutting off. 5. Pumice Applicator:- for filling and smoothing rough callous skin. 6. Big Crude Polish Accessories:- gently exfoliate dead skin for from feet and toes. 7. Rolling Massager:- to make better dead blood circumstances protect the skin from aging.