Specifications: Input: AC 100-240V Output: DC 9V/1A Stepless Speed: 3,000-20,000 RPM Collet Size & Bit Size: 2.3mm / 3mm What for ? Tungsten Carbide Tips for engraving, etching, and more ? Diamond Burrs suitable for sanding, grinding, and more. Notes: Do not press the lock button or touch the rotating bit during running! Or it may cause damage or injuries! Do not let the device get wet or use it in wet conditions! It’s normal for it to get a little warm after use for a while, please give the device a rest every 15-30 minutes of use. You can wear goggles or dust mask to keep dust out of your eyes Always unplug the tool when changing bits or not in use Store the tool in a dry place and keep out of the reach of children Package includes: 1 X Engraver Tool 1 X Power Adapter 1 X Stencil (Random Color) 3 X Tungsten Carbide Tip 3 X Diamond Burr