Youliang 2PCS KY-008 Laser Transmitter 3 Pin 650nm 5V Dot Diode Copper Head Sensor Module for Arduino Raspberry Pi

This product incluyes 2 lasers, but only one of them worked. Upon close examination, I realized one of them was not soldered correctly onto the board. Good thing there was another one, but I still needed two, so I had to go out and buy another one after I had already payed for 2 here. Be careful with that!