[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 an powerful motor, which is suitable for small size cutting, powered by 300mAh lithium battery. It can be by USB Type-C cable, and can work for above 1 hours after a full charge. [Cordless & Portable] Wireless mini rotary tool with compact body and light weight design is comfortable in the hand. Small and body makes easy to handle for fine tasks and delicate work. [Ergonomic Design] and compact design make the electric engraving pen easy to carry. The non- 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:300MHA Charging time:30 minutes 80%, 60 minutes 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 various metal surface polishing, lettering, trimming, etc. Colour:B:Gray & Black Material:Plastic+Metal Size:16x120mm Package Contents: 1 * sanding pen 1 box * sanding heads 1 * 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.