Okay, sorry I got busy for a moment there (it HAPPENS)
The basic units (the way they came from QE) have only three knobs - Sensitivity, Release, and Attenuation
(what others might call threshold, release time, and range)
so the Record Plant mods ad a second panel adding click stopped/stepped controls for Attack and Decay as well as toggle switches for Internal/External Key select, and -10/+4 level sensitivity.
It comes in a blue RPS "lunchbox" that's about 1/2 the size horizontally of a 4u rack with square rubber feet and a handle on top.
there's a permanantly attached snake with all the XLR ins and outs (probably 10 feet long-ish)
I'll try to get some pictures up later or tomorrow.