Encapsulated Class IIIa 5mW laser diode with a 650nm red wavelength. Spec: Weight: 11.85g, Diameter: 10.11mm, Length: 32.82mm, Wire length: 100mm, 650nm wavelength, 2.8 - 5.2V DC, voltage input, 35mA max current draw, Operating temperature -10°C to 40°C. This module is designed to be modulated/pulsed via the yellow wire. So you can use these for laser light shows, laser harps, 'wireless' communications and data transmission, electronic 'trip wires', laser-vision guidance, and more! Simply connect 5V power to the red and black wires, and pull the yellow wire to 5V or ground to turn on and off max freq 50kHz.  ***Please remember do not let anyone look directly at a laser's output without eye protection as it can be harmful** Alltronics part # 1056AF.