From the seller:

Professionally maintained and teched prior to shipment. Classic knee sound - With modern noise specs and improved performance. Really grabs. Programmable analog distortion/warmth - helpful in the pristine but unforgiving digital world. Three audio modes providing user programmable, warm harmonic distortion. Emphasized tubelike, 2nd harmonic in clean and Distort 2 mode. In Distort 3 mode, the distortion becomes dominated by 3rd harmonic, more similar to tape. Distortion indicator lights - A 1% LED and a "Redline" (3%) LED. No hard clipping until a few dB past "Redline". Advanced built-in sidechain EQ -  High mid band emphasis prevents harsh, edgy guitars or vocals from hurting innocent ears.  Low cut keeps the low "sum & difference" frequencies from pumping the upper frequencies of source material. Fool proof operation - Even though there are 384 possible settings(not counting knob settings), it's almost impossible to get a bad sound.  Keep all knobs on 5 or 6 (around middle) with ratio at 6:1 and you won't go wrong. Eight unique curves - From the 1:1 mode that simply warms up signal with low order harmonics without intentional compression, to the "Nuke" setting - a brick wall limiting curve that shines on live drum room mics.  Each curve has its own personality, and release shape.  Most exceptional is the 10:1 "Opto" ratio which uses separate circuitry to emulate the oldest (and valued) "light controlled" devices, such as the LA-2A etc.  See manual to emulate other compressors of old. Discrete and integrated combination - the best of speed/linearity with repeatability. Hand tested & selected components. Huge knobs with high resolution numbering - For easy readability and repeatable settings. They also go to 10 1/2. Locked, calibrated, output level - Allows speed in setting tape and live mix levels. Stereo Strappable Switchable 115/230 volt operation - Extra fuse provided inside unit. Over designed power supplies -  Runs cool, allowing cabinet to be sealed - without heat vents. Long life components. Single height and light weight -  Classic sound in a small, extremely reliable package. True bypass - Know what it's really doing. All contacts doubled up for maximum reliability. No internal audio connectors. XLR and 1/4" phone ins and outs - XLR fully balanced, transformerless design,  pin 2 hot. Changeable by user to pin 3 hot! All metal film and Roederstein resistors in the audio path - top quality components.  Many military spec. parts. Interface and features found nowhere else.