<p>3 DIFFERENT ROLLER HEADS - We have 1 fine roller head, 1 regular roller head and 1 coarse roller head in this set. Meet all your callus removing needs. Refillable coarse roller head that spins 360 degrees for quick results on thick, calloused skin. With our IWEEL electric callous remover kit, pamper your feet with spa-like pedicure in the comfort of your home. NO RISK TO TRY - Please feel free to let us know if you have any question about our product. You have no risk to try. 2 SPEEDS IN ONE BUTTON - 1700x/min when low speed and 2000x/min when high speed. Low speed is suitable for the callus of hands and more delicate skin care. High speed is suitable for stubborn thick callus and dead skin. You are free to choose the speed you need LCD DIGITAL BATTERY DISPLAY - You can see how much battery left and when to charge. 1200mah Large battery capacity, can be used for 120 minutes when the device is fully charged. Say goodbye to AA batteries WATERPROOF DESIGN - IPX7 water resistant. Can be rinsed under running water or submerged in water, but we suggest do not submerge in water too often in case of any problem.</p>