Professional laser module, easy to install, with lower loss, provides 450nm wavelength, for efficient, precise engraving and cutting of plastic, wood, leather, paper and so on, suitable for a wide range of engraving machines. This is the upgraded version with protective cover, safer to use than the old one. Features: Upgraded version: Equipped with adjustable protective cover to protect your eyes, no need to wear extra laser glasses while working, safer to use than ordinary laser head. With adjustable focal length (5.5W or 10W or 20W, 20-70mm) or fixed focal length (30W, 12.6mm or 40W, 15mm or 40W, 40mm or 80W,40mm). Made of premium quality aluminum alloy casing with great durability. It can engrave paper, wood, fabric, plastic, leather, anodized aluminum, etc. Different laser modules for engraving or cutting different kinds of material and different thicknesses. Features high engraving speed, low power loss, good stability and superior performance, with fine heat dissipation to extend its service life. Compact and lightweight, easy to assemble, has over 30cm long line. Comes with screws, convenient and simple to be installed on the machine. Wide application, itand 39 s designed for laser engraver, laser cutting machine, 3D printer, CNC mill and so on, suitable for DIY lover, CNC engineer, artist and more Note: 1. Avoid eye or skin exposure to direct or scattered laser light. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Laser Power: 5.5W or 10W or 20W or 30W or 40W or 80W (Optional) - Adjustable Focal Length: 5.5W or 10W or 20W (20-70mm) - Fixed Focal Length: 30W (12.6mm) or 40W (40mm) or 80W (40mm) Color: Silver Material: Aluminum Alloy and Electronic Components Wave Length: 450nm Luminous Color: Blue Operating Voltage: 12V PWM or TTL Input: DC 3.3V-12V, 100Hz-50KHz Input Interface: XH2.54-3 Pin (and, -, PWM or TTL) Continuous Working: Unlimited Operating Temperature: -20-70 Laser Head Size: Approx. 5.5W or 10W: 105 x 30 x 30mm or 4.13 x 1.18 x 1.18in 20W: 120 x 40 x 40mm or 4.72 x 1.57 x 1.57in 30W (12.6mm): 115 x 40 x 40mm or 4.53 x 1.57 x 1.57in 40W (40mm): 100 x 40 x 40mm or 3.94 x 1.57 x 1.57in 80W(40mm):125 x 47 x 44mm or 4.92 x 1.85 x 1.73in Package Size: Approx. 16 x 6 x 6cm or 6.30 x 2.36 x 2.36in Packing List: 1 x Laser Module 3 x Screw 3 x Washer 6 x Paper Card 1 x Laser Shield (Green) 1 x User Manual (English)