Product name: Electric sanding pen Product accessories: Grinding pen: 40g, 0.5m USB cable: 10g, 20 grinding heads: 60g. Instructions for use: press 1 block once in 2 seconds, press 2 blocks 2 times, press 3 blocks 3 times More than 2 seconds after starting, then press to turn off 3rd gear speed regulation: 1st speed 5000rpm, 2nd speed 10000rpm, 3rd speed 18000rpm Built-in lithium battery: 1300MAH charge cycle 800 times Shipping quantity: 1pcs Color: silver [USB wireless engraver] This engraving tool is equipped with a lithium battery and rechargeable by USB interface. Cordless use will last up to 30 minutes of inactivity after fully charged. Easy to help you complete a better engraved craft. [Multifunctional Wood Engraving Kit] This hand engraving kit can be used as an electric engraving machine or a small rotary tool, allowing you to carve, customize or decorate almost any surface in seconds, such as metal , plastic, glass, ceramic, wood, leather, diamond, stone and many more. It is perfect for small light jobs like DIY creation, crafts, light projects. [Safe and Comfortable Design] The lightweight and compact design of the engraving pen provides comfortable use for precision engraving performance from fine lines to deep grooves. The ergonomic handle adds extra comfort and stable control.