This laser diode module emits a small beam of red light. The focus adjustement is fixed with a dot of glue. It is designed for 4.5V operation (3 batteries), but will work OK from 5 V. Red wire = positive, blue wire = negative. I have no manufacturer data, and I do not know whether this module has been used or what the remaining life time will be. My supplier does not state the output power. Be careful with this item!
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