The lasers power module is relatively large, and eye contact is prohibited, otherwise permanent blindness will occur, and the consequences will be naturalDo not use in flammable and gaseous environments to avoid fire and explosion.This lasers only has 1 3PIN cable, 1 3pin to 4pin cable and 1 lasers, which is suitable for direct installation on the engraving machine. If you need to connect the power directly, please prepare a 12V 5A power cable and cut off the DC power cable. plug, and then cut off one end of the 3PIN wire, connect the red wire to the red wire, the black wire to the black wire, and leave the yellow wire alone.This lasers is fixed focus (not adjustable), the focus is about 1.8CM beam (the light is not a straight beam), and a fixed focus column will be sent to help you quickly find the focus. It is only suitable for engraving machines.This lasers can engrave wood, colored plastic and stainless steel. It can cut thin plywood, cardboard and other materials. It cannot engrave transparent, reflective or mirror materials and metalscolour: as shownMaterial: metalPackage Contents:1 set x engraving machine moduleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.