Voice siren and burglar alarm test

This is a quick sound clip from a video I had taken during burglar alarm testing at the office I work at. I cant post the video for concerns of privacy, but you can hear an Ademco 745X3 (or FBII VS-299) siren driver sounding from over a Ademco 746 speaker. In the background you can also hear one of the Radionics keypads sounding its alarm tone.

Its loud - start with the volume low!

Also as a side note, I am looking for a Simplex 4602-9102 RCU for my 4005 - if anyone has one or knows where I can get one please let me know!