?3 Different Roller Heads?Pedicure sets for feet contains three replacement roller heads of different roughness: a fine roller for daily foot care; a regular roller for newly formed healing tissue and normal skin care; and a rough roller for stubbornly thick calluses and dead skin. ?2 Adjustable Speeds?Two speed adjustments, 1700x/min low speed (one press) for healing tissue and more sensitive skin care, 2000x/min high speed (two presses) for stubborn thick corneas and dead skin. Use electric foot file hard skin remover regularly to keep your feet active. ?IPX7 Waterproof& Portable?Hard skin remover foot electric is waterproof and the whole body can be rinsed under running water. So the callus remover can be used in wet and dry conditions. The compact design makes it easy to carry around and ideal for travel use. ?LED Power Display & USB Charging?foot files for hard skin has a large 1200mah lithium battery and a 5-stage battery display so you can see how much power is left and when to charge. When fully charged, the foot scrub can work continuously for approximately 120 minutes. ?Ergonomic Design?Electric foot file Callus Remover with an ergonomic non-slip handle ensures a comfortable and firm grip. It allows you to easily and effectively remove dry dead skin ,calluses and cracked heel, leaving you with white, soft feet.