Cheap And Discounts 445nm 450nm 400mW 12V Blue Laser Diode Dot Module 33*50mm with Driver and TTL + Fan Cooling for Laser Engraving Machine DIY Wholesale. Buy Directly From Merchant Helloletgo Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.