Then wait. And wait. And wait.
You see, no one really ever responds to these, except perhaps police outside of public rest rooms. Hotels have stopped responding because tourists always think "gee, what's this" and pull it to see what will happen. Nothing.
To make matters worse, there is no defined way of hooking the thing up to a bell or buzzer... or where to put it. Some hotels have it ring a little "ding" at the front desk. Many B&Bs and apartments have it ringing someone's office that isn't always occupied. And get this... some have it hooked to the front doorbell. I suppose that's to notify YOU that you've fallen and can't get up.
Whatever you do, don't get creative and hang wet laundry from the string. You'll definitely get a response--perhaps in the middle of the night--that way!
If you like this post, don't pull the string, just SHARE and LIKE it! Grazie.