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. 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/ 10W/ 20W/ 30W/ 40W/ 40W (Optional) --Adjustable Focal Length: 5.5W/ 10W/ 20W (20-70mm) --Fixed Focal Length: 30W (12.6mm)/ 40W (15mm)/ 40W (40mm) Color: Wine Red 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℃ Laser Head 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 (12.6mm)/ 40W (15mm): 115 * 40 * 40mm / 4.53 * 1.57 * 1.57in 40W (40mm): 100 * 40 * 40mm / 3.94 * 1.57 * 1.57in Package Size: Approx. 16 * 6 * 6cm / 6.30 * 2.36 * 2.36in Packing List: 1 * Laser Module 3 * Screw 3 * Washer 1 * User Manual (English)