Product Material: ABS+PC+Quartz Size: 16.5*7.5*5cm Voltage: DC 5V Power: 6W Battery capacity: 1500mAh Charging time: 2.5 hours Charging method: USB charging Waterproof grade: IPX7 1st gear speed: 1900 rpm Second gear speed: 2200 rpm Color: White, Black Function: Remove dead skin, calluses, cuticle, etc. Package Contents: 1 Piece * Electric Foot Grinder 1. 3 interchangeable grinding heads 3 grinding heads are made of high-quality quartz micro-mineral crystals with different thickness (coarse grinding head for stubborn calluses, medium grinding head for rough, dead skin, fine grinding head for daily skin care ). You can choose a suitable replacement head according to your corneal stiffness. 2. One-button two-speed electronic callus file with powerful motor with high torque. You can easily switch it to 2 speeds: 1900 RPM and 2200 RPM. Low speed is suitable for mildly dead or sensitive skin care. High speed for stubborn calluses or deep cleaning. Professional equipment will help keep your heels and feet soft, smooth and healthy. 3. Vacuum suction to dissipate heat Unlike the traditional drum type, our new callus remover is equipped with rotating planetary gears, which can grind calluses in a large area more efficiently. The specially designed vacuum function sucks in tiny skin calluses and keeps them from flying around. The holes in the sanding head also help dissipate heat and ensure that the device doesn"t get burned by the heat generated during work. 4. USB charging & LCD screen 1200 mAh large battery capacity, USB charging time is 2 to 2.5 hours, and it can work continuously for about 100 to 150 minutes. The LCD display on the file housing allows you to see exactly how much power is left. Thanks to the cordless design, you can also use the electric callus remover on the go. 5. IPX7 waterproof and easy to clean High waterproof, you can enjoy a comfortable massage even in the bathroom. All parts of the foot care device can be rinsed under running water. The included removal tool and cleaning brush will help you easily remove the grinding head and remove collected debris, ensuring a hygienic and comfortable experience.