Ergonomically designed electric foot file: Built-in battery provides 40% longer battery life than similar products, lasting up to 90 minutes. Supports both wired and wireless use. An LCD battery indicator clearly shows remaining power and indicates when charging is needed. Three interchangeable heads: Multiple quartz grinding heads to meet different needs. The coarse head removes stubborn dead skin, the medium head treats rough calluses, and the fine head is suitable for daily care. Choose the appropriate head to remove dead skin, calluses, and cracks, making your feet soft and smooth. Safety technology: Equipped with a pressure-limiting safety device. The device automatically stops if too much pressure is applied. The foot file is IPX7 waterproof, allowing use even in wet environments. One-button two speeds: Low speed 1900 rpm, high speed 2200 rpm. The low speed is suitable for daily care and minor dead skin, while the high speed is suitable for removing stubborn calluses on the heels. This device inhibits bacterial growth and protects foot health. Easy to use, just one button: This foot file is easy to use. The 360° rotation automatically removes dry, hard, and thick dead skin from the heels.