Item specifics: product information Product Name: Micro-Electric Engraving Pen Clamping diameter: 3MM (suitable for all 8MM size grinding heads, reducer drills, carving knives, etc.) Charging specification: USB Type-c (suitable for all USB ports) Charging time: 80% in 30 minutes, 100% in 60 minutes Operating Voltage: 3.6V Battery model: 501550 rechargeable lithium battery Battery Capacity: 300mAh Engine speed: 1st gear 5000, 2nd gear 10000, 8th gear about 18000 Motor power: 8W Endurance: more than 1 hour without load in the highest gear Scope of application: Used for various stone carving, wood carving, olive stone carving, plastic carving, egg carving, glass carving, ceramic carving, drilling and various metal surface grinding, lettering, trimming, etc. Matters Needing Attention: Suitable for various DIY small parts carving, drilling, grinding and other uses. Not suitable for large engraving, stamping, cutting, grinding. It is normal to have a slight noise and temperature when the machine is running. Package conent: Engraving Pen*1 USB Charging Cable*1 Diamond Engraving Needle*2 Wrench*1 Needle Sharpening Tip*1 Cutter*3 Connector*1 Drill*2 Remarks: 1. Please allow 1-10mm difference due to manual measurement. 2. Due to the light and screen difference, the item's color may be slightly different.