405nm 100mW Focusable Blue Violet Laser Diode Module for DIY Laser Engraving Cutting Features: This is a 100mW laser module that could emit 405nm blue violet laser. Focusable design, spot size is adjustable. Durable copper shell for long service life. Support continuous laser output and can work for a long time. Designed for laser engraver, cutter, etc. Specification: Model: LD-F405E04 Shell material: Copper (nickel plated) Wavelength: 405nm (blue-violet) Working current: ≤500mA Output optical power: 100mW Wiring method: 2.1 DC socket wire (the white line is the negative pole and the socket center is the positive pole) Diameter: 12mm/0.47in Length: 45mm/1.77in Weight: Approx. 27g   Package list: 1 x Laser Module 1 x Battery Box   Note: This product should only be used on dark thin plastics.The laser module does not include fixing bracket or heat sink, it needs heat sink to dissipate heat for continuous operation.