Ernie Ball Expression Tremolo - excellent condition and in full working order. Has been gigged with so there are a couple of scratches on the chassis (as seen in the photos), but the pedal is otherwise perfect. A really unique tremolo, the expression pedal controls the rate and depth of the tremolo sound, allowing for some really cool effects. There is also a built in reverb that can be faded in/out along with the tremolo, or on its own, so the pedal can also double as a standalone reverb unit. Great for those psychedelic and surf rock sounds! Performance video available on request if you would like to hear the pedal in action