Henoch You are correct! Further clues could have been, "one of the separate parts requires an external source to be of use"..... "Maybe this can shed some light on the subject",.... "Beauty is only skin deep" etc.
The Where's Waldo clue, meaning it was a tracking device to find someone in a crowd! Wonder why the transponder was not used in subsequent episodes? Makes tracking the away team easy for beaming if they loose the communicators or can't distinguished them from scanning.
p.s. Your episode was on MeTv last night....I guess you're up next!