[Wide Application] Cordless rotary tool can be used to engrave wood, stone, crafts, glass, ceramics, etc. It can also be used for carving, sanding, grinding, drilling, cutting and so on. [Rechargeable Battery] The engraving pen has a powerful motor, which is suitable for small size cutting, powered by 300mAh lithium battery. It can be charged by USB Type-C cable, and can work for over 1 hour after a full charge. [Cordless & Portable] Wireless mini rotary tool with compact body and light weight design is comfortable in the hand. Small and compact body makes it easy to handle for fine tasks and delicate work. [Ergonomic Design] Ergonomic and compact design make the electric engraving pen easy to carry. The non-slip handle adds extra comfort and stable control, providing a comfortable experience for precision engraving performance. Product name: Engraving Pen Power: 8W Voltage: 3.6V Battery type: 501550 rechargeable lithium battery Battery capacity: 300mAh Charging time: 30 minutes to 80%, 60 minutes to 100% Collet depth: 25mm Clamping diameter: 3mm (suitable for all 3mm size grinding bits, reducer drills, carving knives, etc.) Charging specification: USB Type-C (for all USB port batteries) Motor speed: 1 speed 5000, 2 speeds 10000, 3 speeds 18000 Endurance: 1 hour or more unloaded at high speed Application: for all kinds of stone carving, wood carving, olive nucleus carving, plastic carving, egg carving, glass carving, ceramic carving, drilling and metal polishing, lettering, trimming, etc. Color: Gray & Black Material: Plastic + Metal Size: 16 x 120mm Package Contents: 1 x Sanding pen 1 box x Sanding heads 1 x Charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.