Powerful, Safe & 2 Speeds AdjustableElectric Foot Callus Remover have 2 speeds:1700x/min when at low speed and 2000x/min when at high speed.If the pressure is too strong,it will automatically stop working and avoid damage to the healthy skin.^ LED Power Display & Rechargeable Long LastingHigh quality 1200mah large capacity lithium battery has overcharge protection and 5 levels battery display function,you can see how much battery left and when to charge.The USB charging time for 4-5 hours,it can powerfully run continuously for about 120 minutes.^ IPX7 WaterproofThe electric foot file has waterproof design, whole body can be rinsed under running water. You can washing it and keep clean after using. It is suitable for wet and dry use, Electric foot scraper would effectively solves the problem of bacteria growing on the gaps and protects your feet health.^ 3 Replace Grinding HeadCallous removers for feet has 3 different quartz sand grinding heads,rough grinding head can remover stubborn horny dead skin , medium grinding head can remover rough dead skin, fine grinding head use for daily care. You can choose suitable grinding head according to the skin to care,make your feet restore the delicate and smooth skin.