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[OkieBoyKJ5JFG]

It's a simplex "store and forward" repeater.

I found the guy's YouTube page and there's another video on there about this device. It's marketed by Ready Radio and is called the "Repeat-R."

Repeat-R

Repeat-R — One Click Simplex Repeater & Field Comms System The Repeat-R, available at Ready Radio, is a rugged, portable simplex repeater kit built to extend your radio range quickly and reliably. Packaged in a waterproof case and paired with a high-gain ZBM2 antenna, Repeat-R lets you convert a...

readyradio.com

Oh, okay. Seems like it would be easier (and probably more reliable) to just buy a commercially-available simplex repeater. They're not very expensive.