This 5mW 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.
650nm Laser 5V 5mW Module
Laser Head Sensor Module Ky-008 LED Light, Electronic Components - China Electronic Components, Sensor
Módulo Laser KY-008
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Model: KY-008 Operating voltage:5V Output wavelength:650 nm 3 pins module Size: 15 * 24mm
KIRO&SEEU 5pcs KY-008 Laser Transmitter 5V Laser Dot Diode Sensor Module Board for Arduino