From Greer;

The very idea for the Lamplighter Optical Compressor is rooted in
legendary tone and studio lore. The Lamplighter is the result of
countless hours of tweaking, listening, and tweaking again. The idea is
pretty simpleprovide compression that doesnt step on your tone like
other compressors do, make it as transparent as possible, with a low
noise floor, while allowing the effect to be present, and provide
options that musicians the world over have asked for. This is Greer
Amps answer to the question of wide-ranging, useable compression for
all musicians. After listening to studio compressors for years, weve
often wondered why we couldnt find something to get the smooth and
subtle compression that we hear in the studio, on a pedal board. Now we
know that it can be done. Your new favorite compressor is here, and
youre going to love it.

The controls on the Lamplighter provide the user the ability to have
subtle or intense compression. The use of both the Compression and Comp
Mix controls allow for a multitude of sweet spots with different
settings. Add the release toggle into the mix, and you suddenly have a
compressor with the flexibility of a contortionist. The Treble control
can push the tonal range into shimmery, squashed out heaven. Overall,
this compressor is hard to beat, and you will not want to turn it off.

The Lamplighter features top jacks, runs off of 9 volts only (do NOT try to run this pedal off of higher voltages than 9 volts).