USB Wireless Engraver: This electric engraving tool kit equipped with a lithium battery and rechargeable by USB interface. Cordless using will be up to 30 minutes idling after full charge. Easy to help you finish better engraved craft. It can also be used while charging, but we suggest you to use after charging to extent battery using life. 3 Gear Adjustment: 3 gears adjustable speed 5000-25000 rpm, suitable for different occasions. The lowest speed allows you to polish your nails safely, and the highest speed can also be used for metal engraving. With power, gear and overload indicator lights, making it more convenient for you to use. Safe and Comfortable Design: Light and compact engraving pen design provides comfortable use for precision engraving performance from fine lines to deep grooves. Ergonomic grip adds extra comfort and steady control. Wide Usage: This electric engraving tool kit can be used as a micro engraver pen to engrave a variety of materials, like metal, stone, plastic, glass, ceramic, wood, leather, not only can be used for carving, sanding, etching, routing, grinding, drilling, cutting, but also for polishing manicure & pedicure, removing gel and cuticles. Best Gift: This portable and compact electric engraving tool kit is easy to carry around, allowing you to enjoy easy jewellery making time, easy to operate, and suitable for beginners. You can use our kit to make key chains and DIY necklaces as gifts for your friends. Specification: Material: Alloy & Copper Color: Rose Gold/Silver Speed: 5000-10000-18000 Three Levels Power: 10W Battery Voltage: 4.2V Battery Capacity: 300mah Battery Type: Lithium Battery Size: 20 x 14 x 4 cm Weight: 200g Package Include: 1x Engraver Pen 1x USB Power Wire 20 x Bits