Q. How many outputs are there on the Siren 3 Pro?

There are four outputs that can be used to control strobes, sirens, audible alarms, air conditioning, lights and more. 2 on each wiring harness.
Wiring Harness 1: PURPLE for relay control 1 and WHITE for relay control 2
Wiring Harness 2: WHITE for relay control 3 and BLUE for relay control 4