BOSS GEB-7 Bass Equalizer Bass Effect Pedal Thank you for viewing. This is a bass effect pedal that allows you to adjust the sound quality with a 7-band equalizer. I haven't used it much, so the metal parts show some aging, but the other parts are in good condition and I think it's a beautiful item. Of course, the operation has been confirmed. I will answer any questions as best as I can. Thank you. - Model Name: GEB-7 - Brand: BOSS - Function: 7-band equalizer - Frequency Range: 50Hz - 10kHz - Output Type: Stereo Output - Power: 9V battery or AC adapter - Connections: INPUT/OUTPUT #Boss #BOSS #Bass #EffectPedal #Equalizer #Sound #MusicalInstruments