Features Safe to Use: Equipped with built-in safety defence circuit board and intelligent overload defence chip, ensuring automatic power cutoff to prevent damage. Speed Adjustable: 3-level speed adjustment ranging from 5000 to 18000 r/min, suitable for different materials, providing engraving control. Premium Aluminum Alloy Material: Light and easy to control, made of high-quality aluminum alloy, ensuring durability and reliability during use. Convenient : Operates with low noise, allowing for undisturbed use, and its lightweight design enables easy portability for on-the-go convenience. 4 Grinding Heads Included: Comes with 4 interchangeable grinding heads to cater to various engraving needs, offering versatility and flexibility. Features: 1、SAFE TO USE: Micro engraving pen is equipped with a built in safety defence circuit board and an intelligent overload defence chip. When the working resistance is too high, the power will be automatically cut off to prevent damage to the engraving pen. 2、SPEED ADJUSTABLE: 3 level speed can be adjusted within the range of 5000 to 18000 r/min, suitable for different materials. 3、ALUMINUM ALLOY MATERIAL: Made of premium aluminum alloy material, this engraving pen is light in weight and is easier to control and use. 4、CONVENIENT USE: Our engraver pen operates with low noise, and will not disturb others. Light weight, easy to carry around for convenient use. 5、4 HEADS: There are 4 grinding heads in the package that you can use them respectively to meet your different needs. Specification: Item Type: Electric Engraving Pen Material: Aluminum Alloy Battery: 4.2V lithium battery x 1 Battery Capacity: 300mAh (shipped with built in battery) Speed: 5000rpm (low speed), 1000rpm (medium speed), 18000rpm (high speed) Power: 8W Charging Voltage: 5VU Package List: 1 x Pen 4 x Grinding Head 1 x Grinding Head Storage Box 1 x USB Cable 1 x Manual 1 x Storage Box 3 x Cutting Blade 1 x Connecting Rod 2 x Drill Bit Package List 1 x Pen 4 x Grinding Head 1 x Grinding Head Storage Box 1 x USB Cable 1 x Manual 1 x Storage Box 3 x Cutting Blade 1 x Connecting Rod 2 x Drill Bit