Iglobalbuy 40W Professional Water Cooling Co2 Glass Laser Tube 700 mm for Laser Engraver Engraving Cutting Machine Sealed Water Cooling Hermetic CO2 Glass Tube Wavelength: 10.64m;Beam diameter: 2.5 Power output: 40W;Triggering voltage: 24 KV;Operating voltage: 16 KV Optimal operating current: 22 mA;Outer diameter: 50 mm;Length: 700 mm Power stability: 5%;Laser Tube (life hours): 3000-4500 Hours;Gross Weight: 1.3kg