REPLACEABLE SANDPAPER DISCS, one person one sanding pad, avoid bacterial infection, safe hygienic SPEED ADJUSTABLE, easily to control its speed as your request, fast or slow, more convenient. NO NEED BATTERY, no need worry about low battery again just plug into the socket and use it directly ADOPT POWERFUL MOTOR, 360 degree rotating to remove foot heel cracked, dry, dead skin, calluses. COMPACT PORTABLE, just like a small flashlight, universal voltage is (100 to 240V), you can take it to anywhere. Package list: 1 x 1st Generation electric callus remover (gray) 1 x Box replacement sandpaper discs 1 X User manual 1 x US plug with speed controller Please note: this electric callus remover machine is not waterproof. Specification: Rated voltage: DC 12V, rated current: 1A Real output speed: 0-500 rpm Electronic foot file size: 4.56x1.69 inch Electronic foot file weight: 5.99 oz. How To Use . Step 1, DO NOT SKIP THIS STEP Preparation works: we need to soak our foot for 20-30 minutes with warm water, to soften feet dead skin. Step 2 Tear off the protective film of sandpaper disk. Step 3 Paste it on the machine well. Step 4 Connect the supply cord and plug into the outlet. Turn on switch and adjust suitable speed you need. Step 5 In the operation, you can apply appropriate pressure, not too much, or the machine will be damaged. Step 6 After using, remove sandpaper disk and clean machine with dry cloth. This machine is not waterproof, please be attention. Apply foot cream to care foot.