Features
Three-wire input, the red line is positive, black line is negative,  TTL signal yellow line is positive,If you only connect its black wire and red wire, the laser would not work, you also need to connect its yellow wire (TTL+) to 5v+.
This 980nm laser module with driver built-in is an industrial electronic component and  used for Industrial testament, Lab.Before carrying on some laser DIY activities, please read about the technical information first and protect your eyes before laser ray. Be sure the operator has experience in optics DIY or testing.