Never used one of these. I don't think they were around when I had and used the device that this thing is attached to. My version was the type seen in lots of old cowboy movies.
Rather than put all the other shavers to sleep, here is a link to a more technical discussion of Morse code keys: straight, single and dual paddles, keyers, and bugs:
Does Morgan perhaps like muscle cars? I believe that might be a device for syncing carbs on a car that: (a) is carbureted as opposed to fuel injected, and (b) has multiple carburetors.