This is a DeArmond Model 1604 volume pedal with a built in battery powered 'pre-amp'. It’s in perfect working condition. It only has only very slight signs of cosmetic wear. This pedal is heavy and it’s built like a tank. This is an active volume pedal that functions as a gain boost/preamp as well as a volume pedal. It has a knob on the front right side so you can use your right foot to crank up the preamp. Use the pedal to get a clean volume adjustment. Then get more volume by adding some clean sustain with the boost knob then add some more distortion with the boost knob cranked up. It took years for me me to get the perfect guitar sounds and this pedal really did it. I researched and could not find any other volume pedals with a preamp which is what makes this volume pedal so special. It has a new 9 volt battery. It was $90.00 and now sells for $80.00.