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Remote Focus Unit, sometime pronounced "arfoo." A small, handheld keypad and display allowing a user to call up channels and often run cues without being physically at the control console. Referred to as a "rigger's remote" in many non-US countries. Always wired unless preceded by "wireless" or "radio."
One of the first, in the early 1980s, was by Kliegl using a Texas Instruments calculator shell and keypad. (See performer 4 at

RFU for the ETC Express/Expression3 console family:


The wired RFUs for the ETC Express(ion) and Obsession use the Switchcraft-style, gray-insert, "symmetrical" 6-pin XLR connectors.

See also RFR and iRFR.

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