Marian can hazard a guess at his meaning but the whole thing is still making her somewhat uncomfortable, clearly. It doesn't really hurt to give a name, she supposes, with some trepidation.

"I'm Dr. Tenebris. Can you write? Or type?" As clunky as it is (as clunky as her own watch/pack, maybe even slightly more refined) it's easy to find her communicator in her pocket and show it to him, by way of example.