mini laser lens engraver: 1.hollow structure, can put on stone to ... .working voltage:220V,50-60HZ 3.40W power mini laser lens engraverLaser engraving on granite, marble, slate or pebble stonesLaser ... stonePebble stonesSlateFeatures:1. This series machines are used to engrave picture or photos on stone, especially black stone. 2. This ... agent and distributors all over the world ! mini laser lens engraver