This 100mW laser module emits a small intense focused beam of visible red light. The example provided below shows how the module can be used with an Arduino and photo resistor module (available here) to perform basic remote signaling.
Warning: This is a low power laser device, however as with all laser devices care should be taken when in use. You should never look directly in to its beam or point the laser at another person. Doing so may cause permanent eye damage. This item is not suitable for children.
Operating voltage: 5V
Max Current (Laser on): ~30mA
Source wavelength: 650 nm
Size: 15 * 24 mm
1 ? GND
2 ? 5V
3 ? S (Control: HIGH = Laser on);