This is a *USED* Allen-Bradley 1711-OFE1 PLC input/output module. This module is a single unit and is part of the PLC peripheral modules used in industrial automation and motion control systems. Allen-Bradley is a well-known brand in the industry, known for producing high-quality automation products. The 1711-OFE1 module is designed for use in PLC systems and is a reliable choice for businesses and industrial applications.