RKI Beacon 410A Four Channel Wall Mount Controller is a highly configurable, microprocessor-based, flexible and easy to use 4 channel gas monitoring controller. It simultaneously displays the gas type, readings, and status for four channels of gas detection. It can monitor any combination of direct connect sensors (LEL, O2, CO2, and toxic gas sensors), as well as any 4-20mA transmitter. A built-in silenceable audible alarm alerts you to alarm conditions.