It’s a hardwire trigger that will allow you to start/stop recording on a Red Epic from massive distances (up to several hundred feed away). When you depress the momentary switch it discharges the capacitor/sends a 10μF pulse down a BNC’D coaxial cable into a LEMO adapter into the control jack on the Epic and switches record mode off or on.

I’m going to suggest that nobody ever tries to bring it with their carry-on baggage.