Item Type: Electric Engraving Machine Material: ABS, metal Rotational Speed: 3 gears adjustment, 5000, 15000, 25000r/min Charging Voltage: DC3.7V Power Supply: 18650 lithium ion battery 280mAh (built in) Power: 25W 1Rechargeable: Our engraving pen is rechargeable and comes with a USB data cable. The engraving pen has a built in security protection circuit board and an intelligent overload protection chip. 2Auto Power Off: When the working resistance is too high, the engraving pen will automatically turn off the power to prevent damage to the pen. Very safe to use. 33 Speed: The engraving pen works with up to 25W power and 3 speed gears, adjustable within 5000, 15000, 25000r/min according to different materials. 4Low Noise: This engraving pen works with low noise. Don't worry about disturbing your family's rest. The engraving pen is light and compact, so it can be portable and easy to use for beginners. 5Ergonomic Handle: The engraving pen features a lightweight aluminum frame and an ergonomic handle to provide you with precise fingertip control. 6Applicable Scene: The engraving pen is suitable for glass, metal, wood, jewelry and more. Can also be used as part of a wood engraving machine or metal engraving kit.Manual measurement may have error. Please make sure you don't mind before ordering. 1 x Cordless Engraving Pen 30 x Diamond Burr Bits (With Storage Box) 36 x Stencil 2 x Quenching Drill Bits 1 x Handle Extension 3 x Saw Blades (22 mm, 25 mm, 32 mm) 1 x Mini Hex Wrench 2 x Pointed Sharpening Needle 1 x Screw 1 x Charging Cable 1 x Instruction Manual