a laser diode, Class IIIa 5mW, with a 650nm (Red) wavelength. Can be driven from 3.0V to 5.0V DC so they're great for your embedded electronics project, robot or other application.

Note: This is not a laser pointer. It's a diode  You require a 3 to 5 VDC power supply. These diodes are 5mW 

Specifications:

Output Laser Shape: Red Straight Line
Output Power: 5mw
Wavelength: 650nm (Red)
Cable Length: 135mm
Working Voltage: 3.0v to 5.0v DC
Working Temperature: -10°C to 40°C

Applications:

• CNC or Laser Engraver position identification
• Laser test tools
• Concentricity positioning
• Medical equipment positioning
• Production of signal equipment
• Use for DIY or robots