Duelco DSC-MR4Product ID: 1103441DSC MR4 is an output extension unit. DSC MR4 give you the advantage of safety relay outputs.PDF files: Duelco DSC-MR2-MR4 data sheetDuelco Safety Controller manualDuelco DSC-CSU manualDuelco DSC-Expans modules manualDuelco DSC-Fieldbus manualDuelco DSC-MCM manualDuelco DSC-MCT manualDuelco DSC-MSC manualDuelco DSC-MV manual