This laser-guide module is used for object detections with laser, it is consist of 2 laser emitter and a laser receiver. The emitters emit laser, when the laser encounters black lines, the signal port would outputs low voltage and vice versa.
Note that the 2 laser emitters are just for enhancing the module’s performance, they can not be used as TDM(Time Division Multiplex) .
With the advantage of laser, this module can detects object white-color or black-color in a range of more than 50cm, but notice that this module can not detects objects’ color below 30 cm. There is also the Kit Version for the Laser Guide Kit.
You can also refer to here
for the Demos.
This module works as below: