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This item appears to be one of the modules described in the Opto 22 product documentation at http://www.opto22.com/asset/documents/0448_Std_Dig_AC_Inputs_data_sheet.pdf All Electronics is offering it at a considerable discount, as indicated by http://www.opto22.com/products/productdrilldown/display.aspx?PartNumber=IDC5G
Here's a link that works: http://www.opto22.com/documents/0448_Std_Dig_AC_Inputs_data_sheet.pdf