4W Industry Laser 445nm/447nm/450nm 4000mW Blue Laser Dot Module Diode NDB7A75 w/ TTL0-20kHz & Fan Cooling & Long Time Working: Amazon.com: Industrial & Scientific
Opt Lasers 4W Mini RGB Laser Module with 7.5V PSU | 4000mW
Pro 4W RGB DMX Full Color ILDA Animation Laser Light DJ Stage Effect 4W 4000mW | eBay