There's an "event" button on it, that I'm supposed to press if anything out of the ordinary happens, like a headache. I've been wearing it for not quite an hour yet, and I've pressed it four times.
I wore one of these a few years ago because I was having lots of heart palpitations. I felt like I was pressing the event button every two seconds (ok, not quite, but it felt like it). I was sure they were going to come back and let me know that the gig was up and I was an official hypochondriac. Instead, they said that, wow, there were a lot of episodes. Fortunately, they were of a type normal for a woman my age (that sounds old, but they meant 30s), and so no big deal. Basically, this is a long, mememe way of saying not to worry about pressing the event button. I just hope that they figure out something they can do to help.