Hello, when I search the above I get this article:  Connecting The PA1 to Relays for Door Phone Applications  I am afraid that I need a little more information on how to connect a strobe to the PA1.  I use 3CX and have the PA1 connected to page over loudspeakers and that works great.  I need to have a strobe light flash whenever there is an announcement occurring because the environment is very loud.  If someone could point me to some instructions or recommend a particular strobe that would work, I would appreciate it.