engrave 2D or 3D picture in transparent materials Item Parameter Laser Medium Nd: YAG Laser Wavelength 532nm Laser Frequency 200Hz Maximum Engraving Range 280X280mmX90mm Maximum Engraving Speed 6000-10000dots/min Continuous Working Time 12hrs Maximum Power of the Whole Machine 4 KW Number of Laser Heads 1 OR 2 OR 3 Weight of the Whole Machine 230 kg Dimension of the Whole Machine 750mm?75mm?310mm Water Medium Deionized water or pure water Cooling Medium R407C