TGP guys looking at this ad are probably already familiar with this pedal, so I'll limit myself to quoting from the manual: "It is designed to replicate the classic tremolo effect found in many vintage tube amplifiers." This pedal is in very good cosmetic and functional condition. It runs on a 9V battery or standard Boss-type adapter (not included), and also a 12V adapter. Most of my amps have tremolo, so I hardly ever used it. I bought it out of curiosity. Better to sell it to someone who will use it. Monster Effects is apparently out of business now. I'm asking $180 $175 plus including PP and shipping. I'm not really looking for trades. SOLD on Reverb for $175+shipping. Please send me a message if you have any questions.