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. Features: With adjustable focal length (5.5W/ 10W/ 20W) or fixed focal length (30W/ 40W). 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/ 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, it'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. Please wear laser glasses during usage and avoid touching the laser directly with your eyes and skin. 2. Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Laser Power: 5.5W/ 10W/ 20W/ 30W/ 40W (Optional) --Adjustable Focal Length: 5.5W/ 10W/ 20W (20-70mm) --Fixed Focal Length: 30W (12.6mm)/ 40W (15mm) Color: Black Material: Aluminum Alloy + Electronic Components Wave Length: 450nm Luminous Color: Blue Operating Voltage: 12V PWM/ TTL Input: DC 3.3V-12V, 100Hz-50KHz Input Interface: XH2.54-3 Pin (+, -, PWM/ TTL) Continuous Working: Unlimited Operating Temperature: -20~70 Item Size: Approx. 5.5W/ 10W: 105 * 30 * 30mm / 4.13 * 1.18 * 1.18in 20W: 120 * 40 * 40mm / 4.72 * 1.57 * 1.57in 30W/ 40W: 115 * 40 * 40mm / 4.53 * 1.57 * 1.57in Package Size: Approx. 16 * 6 * 6cm / 6.30 * 2.36 * 2.36in Package Weight: Approx. 5.5W/ 10W: 170g / 5.99oz 20W: 258g / 9.09oz 30W/ 40W: 263g / 9.27oz Packing List: 1 * Laser Module 3 * Screw 3 * Washer 1 * User Manual (English)