The ATUC-50IU integration unit gives installers the flexibility to choose the inputs and outputs best suited for a particular installation. It is equipped with two RJ45 ports for connection to other discussion system components, seven Euroblock connectors for audio and control options, and six Euroblock connectors for LED power and general-purpose input/output (GPIO). Its flexible feature set includes a mic input, speaker output, headphone output, control input (talk on, vol. up, vol. down, channel select), LED status output, and GPIO.