Classic Keeley 2-knob compressor. This one has cosmetic wear from age and use, but it works great.

This is straightforward, great-sounding, musical compression that adds sustain and evens things out without killing your tone. I always used it on lower settings for regular guitar work for general tone shaping, and then cranked up the sustain for longer sustain and textural sounds with both guitar and lap steel. Great pedal.