DOD Performer Compressor/Limiter 525A, from the 1980s:
"WITH HIGHER HEADROOM, PRESENCE AND STUDIO QUALITY COMPRESSION, THIS PEDAL HAS A REPUTATION THAT IS WELL DESERVED. DYNAMICS ARE RICHER THAN EXPECTED, AND THERE IS A MAGNETIC, ALMOST MAGICAL QUALITY TO THE TONE." - Guitar Player
Takes two 9v batteries (included). Power supply not included.