Laser Module Blue Violet Dot 405nm 100/180/300mW 2.54-3P Variable Focus TTL/PWM Modulation w/ Heat Sink for DIY Laser Engraver Laser Module Blue Violet Dot 405nm 100/180/300mW 2.54-3P Variable Focus TTL/PWM Modulation w/ Heat Sink for DIY Laser Engraver. Sale price : $12.03 Category : Tools