................. Pressing 0 will silence the alarm so you can listen in!
I think pressing 0 shuts off the consoles alarm (only) AND allows you to listen in. In my case... I may have gone over-board with the large powerhorns.
Haven't had a chance to check this out yet but if you pressed 0 to listen in and the crocks were there, well without the siren they could go on with their business, that to me doesn't make much since. Seems like a real old unit I had would let you listen in with the alarm still going and then if you didn't hear anything threatening you could cut it off, but like I said I'll have to check maybe they changed it.
Tom j