NEJE Max 4 20W laser engraver: extendable to 750x1030mm, motorized Z-axis, multiple passes step-down - YouTube
Amazon.com : NEJE A40640Ⅱ Laser Module, 10W+ Output Power, FAC Tech - 2 x Beam, Built in High Pressure Air Assist, Come with Metal Nozzle, Compatible with Laser Engraver and Cutter :