System Sensor MDL3R SyncCircuit ModuleSystem Sensor's MDL3R (red) Module is designed to work with the SpectrAlert and SpectrAlert Advance series of notification appliances at 1 Hz and horns and chimes at temporal 3 over a single pair of wires. Patented module technology also allows the silencing of horns or chimes on horn strobe and chime strobe models over a pair of wires. The SyncCircuit module is designed to power and synchronize either two 3 amp circuits wired in Class B, or one 3 amp
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