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. 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 (126mm)/ 40W (150mm) Color: Black Material: Aluminum Alloy 43; 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 ( 43;, -, 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)