The LQ series laser modules are designed to provide a compact laser unit at a minimum price. They feature automatic power control (APC) circuitry for a regulated output power over their entire input voltage range. They also have reverse polarity protection.
NOTE: The case of the laser module and the positive input lead are electrically common.

Specifications:

Power output: 3.5mW typical
Wavelength: 635nm RED
Note: This wavelength laser will appear twice as bright to the eye as a 650nm laser of the same power.
Beam diameter: 2mm x 5mm
Beam divergence: 0.6mRadians
Collimating lens: 1 element plastic
Input voltage & current: 3 to 6 VDC, 45mA
Input leads: Red lead positive, Black lead negative
Operating temperature: up to 40 deg. C
Housing material: Brass
Dimensions: .354″ dia. x .71″long, 9mm dia. x 18mm long