I would imagine that it is just a plain old barcode scanner used to scan the MAC address barcode on the box that the phone came in.
I would suggest looking at the gun.
Determining the manufacturer.
Then go to thier website to download the manual for it.
I am certain all will be explained in the manual.
It is what it is!!
__________________________________
A+, Net+, I-Net+, Certified Web Master, MCP, MCSA, MCSE, CCNA, CCDA, and few others (I got bored one day)