This foot file is the motorised callus-remover with a built-in vacuum that will erase those stubborn calluses and smooth the dead skin on your feet in seconds with virtually no cleanup. Now, thanks to the powerful, built-in vacuum, you can remove nasty calluses anywhere, anytime, because all the shavings are sucked right up into the collection chamber for a mess-free pedicure. PLUS, it is rechargeable. Once you run low, simply plug in the USB charging port, and in no time, you'll have a full charge to use over and over again.