✅Replaceable Sanding Heads - Two different grinding heads are available. These typically have different grit levels to suit the severity of calluses and different skin sensitivity. ✅Multiple Speed Settings - These devices typically have three speed settings: low, medium, and high. ✅Nano Atomizing Spray - The 16ml water tank deeply nourishes and softens the skin and effectively reduces friction. ✅IPX7 Water Resistance - The body can be washed with water or used dry.