this is our company new machine,the main strongpoint of other machine,one is the Max eangraving range can reach 300mm*200mm*80mm,another is this machine used 400Hz laser Frequency,can 20000-24000 dots per minute,so it can advance the speed of work time.attache is the TJ YAG-524B machine technical of index,pls check it. Laser Medium :Nd: YAG Laser Wavelength :532nm Laser Frequency :400Hz Maximum Engraving Range :300mmX200mmx80mm Maximum Engraving Speed :20000~24000dots/min Continuous Working Time :12hrs Maximum Power of the Whole Machine :4 KW Number of Laser Heads :1 Weight of the Whole Machine :350 kg Dimension of the Whole Machine:700mm?60mm?530mm Water Medium :Deionized water or pure water Cooling Medium :R407C