Ok, here is the putz part # that is in our telebelt book, A382178 electronic siren (2channel).  It is a Mooseproducts made by GE, model MPI-38.  I did some checking around and I found it on some websites for sale for $15.00.  The websit is

http://www.primaryparts.com/MPI-38?partner=233&gclid=CP61hoqsz40CFRQigAod0XlVQQ

Thats cheap!!!!!!   Good luck

Have one on my 33 meter Alliance love it.

I can see the law coming to the job now at 1 am.

In the early days, in Houston, I was setting up for a slab.  When I reset the radio, I sounded the siren to confirm reset. 

The ENTIRE finishing crew took off toward the woods.  The super and I were the only ones left on site. 

Don 

Now THAT is funny ;~)

Those are the best attention getters on the block. I wish that every pump had to have them. When it goes off, everybody hears it.