Features: Excellent Performance: High performance fixed focus laser head, 24V 2A power supply with high stability, low noise and excellent laser beam quality. Luminous power 5.5W, 50MM focal length, LU2-4-LF laser module is good at engraving and cutting effect is better. High speed and more stable: The laser cutting module adopts compressed laser technology, the laser focal length is about 0.17x0.25 mm, the laser energy has a longer focal length, better engraving and cutting, and can support higher speeds. Protective Design: The laser module shield can filter 97% of ultraviolet rays, you can engrave without glasses, and prevent pets from touching the laser point. The aluminum casing and heat sink dissipate heat quickly, ensuring long continuous working hours. Wide compatibility: the laser can directly engrave smooth stainless steel, aluminum, ceramics, and can easily cut 10mm thick wood. Support Air Assist: (Need to be purchased separately) Equip your laser engraver or laser cutter with an air assist system to increase laser power and efficiency. The air-assisted nozzle adjusts the laser beam more accurately, the airflow from the air pump helps reduce the heat generated by the engraver, and they combine to give you a clean burning and cutting surface. Specification: Model: LU2-4-LF Product Size: 40x41.5x110mm Voltage: 24V 2A Optical Power: 4500-5500 mW Focal Spot: 0.17x0.25mm Focal Length: 50mm Wavelength: 445±10 nm Package Weight: 520g/18.3oz Package Size: 25x14x10cm/9.8x5.5x4in Packing List: 1 x Laser Engraving Module