The Allen-Bradley 2080-IQ4OB4 Micro800 Plug-in Module is a versatile I/O module offering four input channels and supporting both DC and AC operations within a 9 to 30 Volts DC range or 10.25 to 30 Volts AC range. It significantly enhances the functionality and performance of Micro800 controllers, including models like Micro810, Micro820, Micro830, and Micro850, by adding capabilities such as increased processing power and improved communication functions without enlarging the controller's footprint. Designed to expand the embedded I/O functions of the base unit, this plug-in module is compatible with various accessories, including a remote LCD for the Micro820 and a USB adapter as well as an LCD with a keypad specifically for the Micro810, accommodating diverse application requirements efficiently.