... 3.interface:USB 2012 Hot Sales Laser Engraving MachineFeatures of laser engraving machine:1.Working size: 500X300MM,2.Power: ... 60W,3.interface;USB,4.Water cooling,5.Material: Wood, Bamboo, Stone, Organic Glass ... , Plastic, Cloth, Rubber, Arcylic, Paper, Leather, Ceremic, Glass and other nonmetal materials.6.Format ...