THIS IS A AUDIO CONTROL ESP 3 WHICH IS A SPATIAL RESTORATION SIGNAL PROCESSOR WITH PFM AND TONE SHAPING, OPTICALLY ISOLATED, PWM, TRANSFORMER COUPLED POWER SUPPLY, A PERFORMANCE MATCH COMPONENT, AND ALSO HAS THE CENTER CHANNEL IMAGE AMPLIFIER. THE DIFFERENCE BETWEEN THE ESP 2 AND THE ESP 3 IS THE ESP 3 HAS A CENTER CHANNEL IMAGE AMPLIFIER FOR THOSE WONDERING. THIS THING WORKS AND INCLUDES ALL THE PARTS WITH IT LIKE IT DID WHEN IT WAS BOUGHT NEW. PLEASE KEEP IN MIND THAT THIS WAS MADE IN ABOUT 1990 BUT STILL LOOKS NEW AND PERFORMES AS NEW. I JUST SOLD A ESP-2 ON HERE AND THE GUY THAT BOUGHT IT TRIED TO TELL ME THAT IT DIDNT HAVE THE CORRECT WIRED REMOTE HE WANTED A NEW STYLE ONE AND TRIED TO GET ME TO PAY SOME ON IT FOR HIM, PLEASE NOTE THIS THING IS SOLD AS IS AND IT HAS ALL THE CORRECT COMPONENTS WITH IT AS DID THE ESP-2 I SOLD HIM BOTH USE THE SAME STYLE WIRED REMOTE THE ONLY DIFFERNCE IS THE CENTER CHANNEL OUTPUT WHICH IS CONTROLED ON THE UNIT ITSELF VIA A GAIN CONTROL KNOB, NOW THE NEW AUDIO CONTROL UNITS MAY HAVE A DIFFERENT WIRED REMOTE THESE MADE IN THE EARLY 90'S DID NOT. SO THAT BEING SAID, AGAIN I WILL NOT BUY FANCY PAINT OR LED'S OR A NEW REMOTE OR WHATEVER ELSE ANYONE WOULD LIKE ON THIS ITS SOLD AS IS.