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.
Laser Head Sensor Module 5V 650nm Red Color Diode KY-008
KY-008 650nm Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head for Arduino - AliExpress
HOW TO SETUP WIRE AND CODE A KY-008 LASER MODULE
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2PCS KY-008 650nm 5V Red Laser Sensor 6mm 5mW Transmitter Module Dot Diode Copper Head For Arduino Compatible With UNO MEGA 2560
These are great laser modules for laser sensor projects These 3 pins module have 5V working voltage, 5mW power, output wavelength 650 nm With fixed
8PCS 3 Pin 650nm 5V Laser Transmitter Sensor Module Board KY-008 Dot Diode Copper Head Sensor Module Diode Laser Mini laser head for Arduino Raspberry
Arduino Laser Module: Connecting KY-008 to Arduino
KY-008 650nm 5V Laser Sensor Module for Arduino With Demo Code - AliExpress
Output power: 5mW Wavelength: 650nm Working Voltage: 5V
HiLetgo 5pcs DC 5V Laser Transmitter Module Wave Length 650 nm for Arduino PIC AVR
Ky-008 3pin 650nm Red Laser Transmitter DOT Diode Copper Head Sensor Module - China Ky008, Laser Detector
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Alinan 4pcs Laser Sensor Module Non-Modulator Tube Laser Receiver Module with 4pcs KY-008 650nm Laser Transmitter Module for AVR - Yahoo Shopping
KY-008 5mW Laser sensor Module - Alphatronic
Ky-008 650nm Laser Sensor Module 6mm 5v 5mw Red Laser Dot Diode Copper Head For Arduino - Sensors - AliExpress