Permanent installation version of the ATUC-50DU for use with the ATUC-50 Digital Discussion System. The ATUC-50IU has two RJ-45 ports, seven Euroblock connectors for audio and control options, and six Euroblock connectors for LED power and general-purpose input/output (GPIO). Mic input is compatible with ATUC-M43H, ATUC-M58H, ATUC-M32L, AT8657/LED, U891RCx and other microphones. Includes mic input, speaker output, headphone output, control input (Talk On, Vol. Up, Vol. Down, Channel Select – Open/Closed contact), LED status output, GPIO. Designed for discreet installation (e.g., under a table). ATUC-50CU firmware version 1.6.0 or higher is required. For wired or wireless systems.