1. This product is equipped with dustproof container, designed for dry and rough hand, foot or heel skin, should not be used on other parts of the body.2. There are 2 speed modes and 3 roll heads:Fine roll head - Suitable for hand calluses curling dead skin and more delicate skin care;Regular Roller Head - for newly formed calluses and normal skin care;Coarse roll head - for stubborn thick calluses and dead skin.3. Gently turn the drum head and stay in the dry rough skin area for 2-3 seconds. Gently slide the roller head over the skin, not too hard or the product will stop working.4. Whole body washable. Equipped with 1200mAh battery, fast charging speed, long working time, long life.5. Before applying, cleanse and soften your skin, then dry it to ensure best results. Do not use this product if your skin is cut or bleeding.