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16 mic/line in and 4 line out I/O Expander using A3232 network protocol and providing fixed, additional I/O anywhere on the network. Up to two A164WALL LCD units can be daisy-chained via A3232, or the second A3232 port can be used to create a redundant network. All LCD labels are dimmable and can be customised using 4REA4 software.