I also work with patients on a nightly basis and have not had to explain it even once yet. Mine has never beeped while wearing it except when I put it on for the first time. Even if my display beeps around other people, they just assume its an alarm.
I've had my GWF on my arm continuously since Jan. 1st ( except for showers) and I LOVE LOVE LOVE it!
Just my 2 cents.