Laser pointer Lego Brick

My son asked my to make a laser pointer for his Lego. At one rainy weekend we have created the following Lego laser pointer module. I've added an additional resitor to the laser diode to ensure the eye safety.

This are the componets



Integration of the laser diode and of the micro switch in the brick.



Integration of the batteries in the battery box. Inside the box there are metal sheets which are soldered to the wires.



The complete module.