Frequency: 4000HZ Diode pump ellipse 170*140*100mm directly engraving higher resolution,longer life time, more compact. NEW MODEL! Hot Sale!New Business Opportunities with Shining3d Laser Engraving Machine, Small cube size to large plate size, 2D and 3D Sub-surface Laser Engraving Possible.High Resolution Solution: Model Number: SPARKWith the technology of diode pump, air cooler, engraving speed ...