The 33D660-5 from US-Lasers, Inc. is a Red Laser Diode that operates at a wavelength of 660 nm. It delivers a continuous-wave optical output power of 5 mW with a beam divergence of 5 degrees (parallel) and 25 degrees (perpendicular). This laser diode has a threshold current of 20 mA and a built-in photodiode for monitoring laser output. It requires a DC supply of 2.7 V and consumes 40 mA of current. This laser diode is available in a Ø3.3 mm package.