System Sensor MDL3W Sync Circuit Module (White)The MDL3 Synch Circuit Module is designed to work with the SpectrAlert Advance series of notification appliances to provide a means of synchronizing the temporal coded horns and chimes, synchronizing the one second flash timing of the strobe, and silencing the horns and chimes of the horn strobe and chime strobes combination over a two wire circuit while leaving the strobes active. Each MDL3 module has the capability of connecting two Style Y (Class