The high-performance Yongli H4 tube delivers 100W of power for up to 12,000 hours of usage and extends its lifespan when consistently used at lower settings. Experience Safe & Clean Laser Engraving. The widened viewing window is made from flame retardant material to ensure lasting safe use, while the built-in air assist efficiently removes smoke and dust to protect your laser lenses and reflective mirrors. Enjoy US-Based Support & Service. 1x 100W CO2 Laser Engraver.1x Tube of Silicone Insulation.