Feature:1. Charging Method: The engraving pen has a 4.2V lithium battery and is equipped with a USB cable. It can be charged by connecting to a USB interface such as a power bank, a computer, and a charger, which is easy to use.2. Safe Performance: The engraving pen, with a built in protection circuit board and an intelligent overload protection chip, is able to cut off the power automatically when the working resistance is too large to prevent the pen from being damaged. It is safe to use this pen.3. Low Noise: The engraving pen works with such low noise that you do not need to worry whether the manipulation will disturb other people or not. Use it boldly!4. Easy Carrying: The engraving pen is small but delicate. You can take it anywhere you like to do your engraving work. The engraving pen is going to show its professional performance.5. Main Application: The engraving pen is easy to manipulate, which makes it very suitable for both beginners and professionals. The pen enables users to customize everyday items to create one of a kind personalised accessories and gifts.Specification:Item Type: USB Rechargeable Engraving MachineMode: E108Material: Aluminium Alloy Battery Mode: 1 x 4.2V Lithium Battery Battery Capacity: 300mAh(Battery Included)Rotating Speed: 5000rpm(Low Speed), 10000rpm(Mid Speed), 18000rpm(High Speed)Power: 10W Package List:1 x Engraving Pen20 x Grinding Head1 x Charging Cable1 x Grinding Head Storage Box1 x Manual16 x Engraving Template3 x Cutting Disc1 x Connecting Rod