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What is this hardware?

I have a PEN that plugs into the GamePort of the Apple II

It shines a red light at whatever you point it at.

It returns an ON for PushButton2 when it is pointed at WHITE paper
It returns an OFF for PB2            when it is pointed at Writing on
paper.

Is this a bar code reader?  I know it is NOT a light pen, because it
supplies a light source, and it doesn't work properly as a light pen
(wont detect 'light' from the monitor)