Product parameters:Wavelength: 405nm Power: 50mw Voltage: 3 Working Temperature :15℃~35℃ Red line is positive, black line is damaging Diameter 12mm length 40mmDetails:1 is a 405nm 50mw focusable laser module. You can prefer a dot shape, lines shape, and circulation form module in step with your needs. 2 order to increase the working time of this module, we add a heatsink bracket to this module. 3 preserve the lens clean:1PC* Adjustable focus laser diode module 405nm 50mw (one dot form moduel,or one line form module ,or one move form module)