Product description Material: ABS+PC+Quartz Size: 16.5 x 7.5 x 5 cm Voltage: D5V Power: 6W Battery capacity: 1500mAhCharging time: 2.5 hours Charging method: USB charging Waterproof rating: IPX7First gear speed: 1,900 rpm Second gear speed: 2,200 rpm Colors: White, Black Function: exfoliation of dead skin, calluses, cuticles, etc. Quantity: 1 piece Package Content: 1 piece * Electric Foot Sharpener 1. 3 Interchangeable Grinding Heads 3 grinding heads are made of high quality quartz micro-mineral crystals and come in different thicknesses (coarse grinding head for stubborn calluses, medium grinding head for rough and dead skin, fine grinding for daily skin care). You can choose the suitable replacement head according to your cornea hardness. 2. 2 speeds with one button The electronic callus remover has a powerful high torque motor. You can easily switch it to 2 speeds: 1900 rpm and 2200 rpm. Low speed is suitable for soft dead skin or sensitive skin care. High speed is suitable for stubborn thick calluses or deep cleaning. Professional equipment will help keep your heels and feet soft, smooth and healthy. 3. Vacuum Suction\u0026 Heat Dissipation Unlike conventional roller style, our new callus remover is equipped with rotating planetary gear, can grind callus more efficiently in larger areas. A specially designed suction function can suck tiny skin calluses and prevent them from flying. The holes in the sanding heads also help dissipate heat and ensure that the devices are not burned by the heat generated during work. 4. USB Charging \u0026 LCD Display With 1200mAh large battery capacity, USB charging time is 2-2.5 hours, can work for you about 100-150 minutes continuously. The LCD display on the case of the corneal rasp allows you to see exactly the remaining battery level. Thanks to the cordless design, you can also use the electric callus remover on the go. 5. IPX7 waterproof \u0026 Easy to clean High water resistance, you can enjoy a comfortable massage even in the bathroom. All parts of the foot care device can be rinsed under running water. The attached removal tool and cleaning brush will help you easily disassemble the grinding heads and remove any debris that has collected, ensuring you have a hygienic and comfortable experience.