This laser diode module emits a small beam of red light. The focus can be adjusted. It is designed for 4.5V operation (3 batteries). Red wire = positive, black 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, I think it is a class IIb.
Be careful with this item!
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