TJ laser subsurface engraving machine

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 :300X200mmx80mm
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¡Á760mm¡Á1530mm
Water Medium: Deionized water or pure water
Cooling Medium: R407C
Payment:negotiation

1 set