Laser head engraver 450nm 15000mW 12V TTL 15W metal stainless stoone

450nm 15000mW 12V High Power TTL Adjustable Focus Blue Laser Module DIY Laser engraver accessories 15W laser head Pulse Power 15W, 450nm laser module (send glasses , power supply as free) Specifications: Main dimensions: length 50 mm * 50 mm * 100 mm Wavelength: 445nm / 450nm Output Power: 15 W pulsed, 8 W average Modulation frequency: ttl can be modulated, 0v-off, 5 open, switching frequency lt;9 kHz Operating voltage: DC = 12 Operating Current: I lt;3A Focal length: not regulated Operating Temperature: 15 ℃ ~ 45 ℃