[Strong, safe, adjustable in 2 levels] The electric foot callus remover features two speed settings: low speed at 1700 rotations per minute and high speed at 2000 rotations per minute. If excessive pressure is applied, the device automatically stops to help prevent damage to the skin on the feet. Promotes healthy-looking skin. [LED power display & long-lasting rechargeable] Equipped with a high-quality 1200mAh large-capacity lithium battery with overcharge protection and a 5-level LED battery indicator. Easily monitor remaining power and know when to recharge. USB charging takes 4 to 5 hours, providing up to 120 minutes of continuous use. Note: Use a charging voltage of 5V/1A to maintain optimal battery life. [Waterproof design] The electric foot file has a waterproof construction, allowing the entire unit to be rinsed under running water. Easy to clean after each use. Suitable for both wet and dry applications. Helps reduce bacteria buildup in crevices and supports overall foot hygiene. [Replaceable grinding heads] Includes three different quartz sandstone grinding heads. The coarse head effectively removes tough, stubborn dead skin. The medium head targets rough and flaky skin. The fine head is ideal for regular maintenance and smoothing. Choose the appropriate head based on your skin needs to help restore soft, smooth feet.