... .work voltage:220V,50-60HZ 3.40W power cheap and mini granite stone laser engraving machineFeatures:1. This series machines ... heavy stone can be moved easily, therefore, it works with any size of material.Technical Specifications: ModelSM-3020YDX,Y working ... grave stone, arts and crafts, phograghic studio, sign making, advertising etc.More machine pictures:Samples: cheap and mini granite stone laser ...