The Gentex Model AVSM control module is designed to provide an easy way to synchronize multiple horns as well as strobe light flashes using only two wires in those instances where a synchronized flash is required. The control module has the capability to synchronize multiple horn signals with a code 3 temporal pattern and the ability to silence the horn while allowing the strobes to continue to flash. By incorporating the control module as shown in the following drawings, the control module will control the power to the horns to produce the synchronized operation. In unison mode, the horn cannot be silenced while maintaining strobe operation. The AVSM is warranted for three years from date of purchase.