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.
KY-008 5V Sensor Module Board For Arduino AVR PIC Laser Transmitter 650nm
KY-008 650nm 5V Laser Sensor Module for Arduino With Demo Code - AliExpress
Laser Module 650nm 5v - Red Color Laser, Laser Dot Diode Module, Red Laser Dot Diode Module, लेज़र डायोड मॉड्यूल - Labsguru Technologies Private Limited, Lucknow
2Pcs KY-008 650nm Laser Sensor Module 6mm 5V 5mW Red Laser Transmitter Module Dot Diode Copper Head for Arduino
KY-008 650nm 5V Laser Module
2Pcs KY-008 650nm Laser Sensor Module 6mm 5V 5mW Red Laser Transmitter Module Dot Diode
KY-008 650nm 5V Laser Sensor Module for Arduino With Demo Code - AliExpress
factory 650nm laser sensor module red
KY-008 5mW Laser sensor Module - Alphatronic