The pedal is in excellent condition. It has lived in my bedroom. I'm including an A/C adapter with the pedal, which normally runs another $20 or so.
From Boss:
The GEB-7 is a seven-band equalizer created specifically for the frequency range of the electric bass. Since the frequency range extends down to 50Hz, the GEB-7 is also great for adjusting depth and bottom end of an upright bass with pickups.
50Hz to 10kHz frequency range specifically designed for bass
Full range response, even for five- and six-string basses
Can be used as a "boost" or "cut" pedal using the level control knob
Great for eletric-acoustic bass applications