Powerful, Safe, and 2-Gear AdjustableThis black electric foot file features 2 speeds: 1700x/min at low speed and 2000x/min at high speed. It automatically stops working if the pressure is too high, preventing damage to healthy skin. LED Power Display & Charging TimeHigh-quality 1200mAh lithium battery with overcharge protection and battery display function, allowing you to see the remaining power and when to charge. USB charging time is 3 hours, and it can run continuously for about 90 minutes. Note: Use a charging voltage of 5V/1A to avoid affecting the lifespan due to excessive voltage. IPX7 WaterproofThe electric foot file has a waterproof design, and the entire body can be washed under running water. It can be washed and kept clean after use. Suitable for wet and dry use, the electric foot file effectively solves the problem of bacterial growth in cracks and protects your foot health. 3 Replaceable Grinding HeadsThe foot file has 3 different quartz grinding heads: a coarse grinding head for removing stubborn dead skin, a medium grinding head for removing rough and dead skin, and a fine grinding head for daily care. Depending on your skin, you can choose the appropriate grinding head for care, allowing your feet to restore delicate and smooth skin.