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12V 635nm 638nm 400mW Orange Red Laser Diode Module with Driver Board and Cool Fan 33x50mmDescription Output Power:400mW Wavelength:635nm 638nm Working:Voltage 12V Lens:Glass Material:Metal Focusable;None Laser Shape:Dot Dimensions head: 34X34X50mm Currancy board: 55X64X90mm It makes use of 12v voltage to drive! Red twine for 12V +, black twine for 12v-, blue twine for TTL +, white twine for TTL-. If you dont prefer TTL, simply go away them unconnected. kit include: 1pc 638nm 400mw 12v purple laser module