Features 【SCOPE OF APPLICATION】: A professionally made electric grinding pen, the grinding head with mini grinder is also small in size, can be used for grinding and carving small patterns, such as grinding carved wood, plastic, stone, jade, jewelry, etc. 【SIZE】: The grinder chuck can hold grinding heads with a handle diameter of 0.5-3.2mm, and is equipped with 9 types of grinding heads, which can be replaced according to different grinding needs. You can also install other cutting or polishing types of grinding heads to meet different grinding needs. 【USE】: Pen-shaped design, cordless engraving machine is easy to grasp, comfortable and natural, adjustable gear, you can press the shift key to adjust the grinding speed, there are three gears to choose from, 5000-15000r/min adjustable, key operation, convenient and labor-saving. 【FLEXIBLE】: The electric grinder can be connected to a USB socket for power supply. It will not be unusable because the battery is dead and the socket does not match. It can be charged and stored by connecting a laptop, power bank, USB socket, etc., and the engraving machine can be used anytime, anywhere. 【MAINTENANCE】: Sturdy casing, the pen-type mini electric grinder is wear-resistant and wear-resistant, light and compact, can be carried and stored with you, the electric grinder responds quickly, and it is easy to control the direction and speed of engraving to create satisfactory engraving results. Description: This product is a pen type mini electric grinding machine, which can be used for cutting, grinding and polishing by connecting USB port to power. With this electric grinder, you can polish and carve jade and jewelry by yourself. Specifications: Product material: plastic Revolving speed gear: third gear adjustable No-load speed: 5000-15000r/min Length of grinding machine: about 16.8cm Chuck size: about 0.5-3.2mm Length of power cord: 1m Power supply: USB Input voltage: 5V/2A Output power: 30W Packing type: colorful box Gross weight: 170g Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-3cm measuring deviation due to manual measurement. Packing list: 1 x Electric rotary grinder 9 x Grinding head 1 x USB cable 1 x Wrench Package List