Feature: 1. Safe and Reliable: The engraving pen has built in safety protection circuit board and intelligent overload protection chip, can automatically cut off the power supply to prevent damage when the working resistance is too large, safe and reliable to use. 2. Speed Adjustment: The power is up to 10W when working, and the speed is adjustment in 3 levels, which can be adjusted within the range of 5000‑18000RPM per minute, suitable for different materials. 3. Low Noise: This engraving pen allows you to customize items and create a personalized accessory or gift, has low working noise, do not worry about affecting the rest of the family. 4. Portable and Easy Operation: The engraving pen is lightweight and compact, built in battery and rechargeable, comes with USB cable, can be carried anywhere, easy to use, perfect for beginners or professionals. 5. High Performance: This improved high performance motor has better control and handling than other motors on the market, lightweight aluminum frame and ergonomically handle provide you precise fingertip control. Specification: Item Type: Electric Engraving Pen Material: Aluminum Alloy Model: E108 Battery: 1 x 4.2V lithium battery (Built in) Battery Capacity: 300mAh Speed: 5000rpm (low speed), 10000rpm (medium speed), 18000rpm (high speed) Power: 10W. Package List: 1 x Electric Engraving Pen20 x Grinding Head1 x Charging Cable1 x Grinding Head Storage Box1 x Manual Note: If you need to work for a long time, the machine can be used while charging.