USB Wireless Engraving Pen - This metal engraver pen equips with an excellent motor and a Lithium battery and is rechargeable by a USB interface.Voltage is 3.6V, Battery capacity is 280mAh. After fully , the maximum speed can work continuously for about 110 minutes. Visible 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 to use Multiple Accessories - These metal engraving machine kits include Diamond Burr Bit (2.35mm) Drill Bit (1mm, 1.5mm), Saw Blades (22mm, 25mm, 32mm), and other acceesery in the pictue show. These accessories are enough to work on engraving, carving, sanding, polishing, , routing, grinding, drilling, cutting. Wide Usage - This multi-functional pen 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, , routing, grinding, drilling, cutting, but also for polishing manicure & pedicure, removing gel and cuticles. Best gift - This portable and compact pen is easy to carry around, allowing you to enjoy easy jewellery making time, easy to operate, and suitable for beginners. Use our kit to make keychains and DIY necklaces as gifts. Material: Metal colour: silver Package Contents: 1 set x engraving pen 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.