Features: - Designed for laser engraver machine, laser cutter, 3D printer, CNC millling, replacement for arduino project. - 2 in 1 focus, adjustable lens and fixed focal length in one module. - 7.5W blue light laser, suitable for engraving and cutting. - More Safety, built-in protective glass to protect eyes! Even without wearing protective glasses, the operation is more comfortable. - Modified laser air assist, avoid smoke damage to the lens. - More quiet, intelligent drive adjust the cooling fan speed according laser temperature. - Easy to use. Digital PWM wave pulse signal generator adjustable frequency duty-cycle board replacement for NEJE laser module. - Sliding slot is provided for easy adjustment of focus. - Engrave a wide range of soft materials: MDF/Balsa/Paper/Wood/Fabric/Plastic/Leather/Plywood/Foam Paper/Anodized Aluminum. Note: *12V3A power supply and goggles are not included in the kit. *Can Engrave: MDF/Balsa/Paper/Wood/Fabric/Plastic/Leather/Plywood/Foam Paper/Anodized Aluminum *Can Not Engrave: Metal/Glass/Stone/Ceramics/PCB/Stainless Steel/Reflective Material/ Transparent Material *Smoke will be generated when burned, please pay attention to smoke exhaust indoors. *Please wear laser goggles during usage and avoid touching the laser directly with your eyes and skin!