SUNWIN 5500mW All-metal 5.5W 30X23CM Laser Engraving Cutting Machine DIY Engraver Logo Marking Leather Printer Format A4 (5.5W) Please konw that this engraving machine can not engrave on the metal directly! Format A4 All metal body, strong and durable, high accuracy. Max. Engraving Area: 300*230mm No limit on objects size,the machine can be set and worked on the object, eg, 5.5W(5500mW) laser power Simple & easy to use software. Support Windows 7 & Windows 8 After testing, 5.5W can cut 4MM linden wood,more powerful,cutting wood more easily.2.8W can cut 2MM linden wood.