[What's in the box] 1 X Main Body 1 X Rough Roller 1 X Smooth Roller 1 X USB Charging Cable 1 X Cleaning Brush [Product Specification] Product Name: CR01 Voltage/Power: DC 5V(USB) / 3W Battery: DC 3.7V, Lithium Ion Battery, 250mAh Speed: 2 step adjustment Charging Time: Approx. 120 Min. Hours of Use: Approx. 60 Min. Weight: 95g(0.2 lb) Size: 180 X 34 X 34 (mm) / 7.1 X 1.3 X 1.3 (Inches) [Caution] - This product can only be used for exfoliation of feet calluses and dead skin. Do not use this product elsewhere. - Each roller is recommended that is used by one person exclusively for hygienic reasons. Do not share the roller with another person. - Do not rub the product continuously or apply strong pressure on the same area for more than 2 to 3 seconds. - Overuse can cause skin irritation. - Stop using the product if it causes pain or inflammation. - This device has no waterproof function. Do not soak it in water or use it in the shower. - Keep the device away from one's head, scalp, eyebrows, eyelashes, clothes, brush wires, cords, and shoelaces. - Lubricating oil may leak out during use. You may wipe it clean with a wet tissue or tissue paper. Lubricating oil leak is a normal phenomenon and does not mean the product has defects.