Features 1、USB Rechargeable: Our mini engraver is rechargeable with USB cable. The noise is very low when working, so you don't have to worry about disturbing your family or customers' rest. 2、3 Speed: Mini engraving pen works with up to 10W power and high performance 18000RPM motor, 3 speed can be adjusted in the range of 5000-18000r/min for different materials, such as wood and metal. 3、Automatic Power Cut Off: The mini engraving pen has built in safety protection circuit board and intelligent overload protection chip. When the working resistance is too large, the power will be automatically cut off to prevent damage, making it very safe to use. 4、Accurate Bearing: Polishing engraver built in accuracy bearing and extended rotation shaft integrated design, effectively improve the concentricity of electric grinding rotation, easy to achieve accurate punching and engraving. 5、Ergonomic Grip: The electric engraver pen features a lightweight aluminum frame and ergonomic grip to provide you with precise finger tip control with a lightweight and compact body. You can carry it around with you and it is easy to use. Specification Item Type: Engraving Pen Material: Aluminum Alloy Battery: 4.2V Lithium Battery x 1, Battery Capacity 300mAh (Shipped With Built In Battery) Rotational Speed: 5000rpm (Low Speed), 10000rpm (Medium Speed), 18000rpm (High Speed) Power: 10W Package List 1 x Engraving Pen 1 x USB Cable 2 x Wool Sanding Wheel 5 x Engraving Bit