A. This electric foot file features a new design. It is a rechargeable product with a digital display, offering a convenient foot care experience. It comes in a complete set, is washable, and can automatically remove dead skin and calluses from the feet. B. In terms of design, it utilizes advanced digital display technology, allowing you to clearly understand its working status during use. The rechargeable design frees you from the constraints of traditional power cords, making it more flexible to use. You can easily operate it anywhere in your home. Additionally, its washable feature makes it convenient to clean the foot file after use, ensuring its hygiene. C. Regarding its use, its main function is to remove dead skin and cutin. It can effectively help you remove long - accumulated calluses and dead skin from your feet, restoring the smoothness and softness of your feet. Regular use of this foot file can keep your foot skin in a healthy state and improve your quality of life. It is suitable for multiple regions around the world, including Europe, South America, Southeast Asia, North America, Northeast Asia, the Middle East, etc., and is well - received. D. Meanwhile, it has an authorized self - owned brand, which guarantees the product quality.