The Sync Circuit is used to synchronize the pulse features when using more than one light, especially when lights are close together. This unit can increase visibility in the lights by creating alternating flashing. This creates increased safety in flight. It is manufactured for use between any two wigwag lights to increase safety via visibility.
Pilots HQ responded promptly to my order. They were delivered on time and pricing was reasonable. I would order from them again. Top notch company, very professional.