Feature: Two Power Supply Methods: Easy to use, can install 4 No. 7 batteries or connect to USB, more powerful. Don't worry about the trouble caused by power failure Multi-head Exchangeable: Rough grinding head is suitable for the old dry cracked cocoon of the heel, medium grinding head for dead skin, and peeling Efficient Heat Dissipation: The premium body is good for efficient heat dissipation, no worry about overheat. Great design makes it extremely quiet and smooth with low vibration when doing foot skincare How to use Step 1. Insert the Grinding head into the device, making sure it is fully engaged，and press the start. If your foot has hard or thick calluses, do not soak your feet before using. For good results, your feet should be clean and dry. Step 2. Grind The Foot Gently rubbing your foot till dead skin drop off. Don’t apply too much pressure, This is to protect your skin. Step 3. Apply Foot Cream Wipe your feet with a dry cloth or clean the dead skin, Apply moisturizing cream, massage your feet slowly. When the power is off, roller head will be covered with dead skin, please use a brush to clear all the waste, Remove the grinding head you can direct cleaning under the tap. Note: Once or twice a week, every 5-10 minutes. It's that simple to remove dead skin, protect your health.