Product Feature This Callous Remover is an innovative device created to smooth dry, rough and calloused skin on the feet. This Callous Remover works faster and is safer than metal scrapers, with no blades to cut the skin, and easier to use than other methods, that require constant rubbing to achieve results. It is battery-operated and designed to fit comfortably in your hands. Smooth, silky feet has never been easier. How to charging Before using the appliance for the first time , or if it has not been used for quite a while, it should be charged for at least 4 hours. If fully charged you can use the appliance for 50 minutes. Charging the appliance regularly for 4 hours but for no more than 8 hours. TIPS 1.This Callous Remover is recommended for one person only. For hygienic reasons, unique rollers grinding should not be shared with others. 2.This Callous Remover is suitable for use on the feet and heels. Also working on hands but must be more careful when you use and do not use this device on the fragile skin or body. 3.Do not use if you have diabetes or poor blood circulation. 4.If you have any skin conditions or other medical issues, please consult with your physician prior to use. 5.Do not use on skin for more than 2-3 seconds at a time, or apply strong pressure. 6.Do not use on warts ,on sores or open wounds. 7.Stop using if skin becomes sore or inflamed. 8.Keeping the appliance dry, when it is not to use. 9.Keep your unit out of reach of children as it is not intended for use by children. Package Includes: 1 *Rechargeable Callus Remover 1 *Extra Roller Head 1 *Transparent Yarn Bag 1 *USB charging line 1 *Manual