USB Powered 1200mAh battery, compatible with USB charging adapters, power supplies, laptops and more. Easily used indoors and outdoors! The LED screen will display the remaining power and prompt you to charge. Two Speeds The electric foot file has 2 speed settings that can be adjusted according to your needs. Speed 1: 1700 rpm / Speed 2: 2000 rpm. Two Roller Heads Comes with 2 different styles of roller heads: 1 thin roller for daily foot care; 1 thin roller for daily foot care; 2 roller heads for daily foot care. 1 regular roller to remove dead skin and 1 coarse roller to remove annoying calluses. Made of exfoliating particles, this roller removes all calluses quickly and easily, leaving you with incredibly soft feet in no time. Waterproof and easy to clean It allows you to keep the head underwater. The pedicure roller is removable with a single button, making it easy to clean and replace. Note: To ensure the life of the pedicure file, do not immerse it in water frequently. use