This is a Really Nice Levelling Amplifier from the 2000s. Small and compact, this beast works well with vocals, bass guitar, acoustic guitars and two-mix sources and famously paints a 'thick and gooey' character over it's signal.
The RNLA is a compressor of sorts, with parameters for threshold, attack & release, ratio and output gain. It fits a niche even alongside sought after classic compressors and levelling amps and with its compact size and simple navigation its perfect for people who are new or seasoned to this kind of gear.
I would recommend checking out the guide written by FMR themselves. This goes into all the detailed specs and describes fully what you can expect to hear from this great piece of kit.
This specific item is in excellent condition, with only a couple small paint chips off the top that you can see in the photos. It comes in its original box with the power supply (with adapter) and the screw for rack mounting.
Hope you enjoy just as much as I have.