The MXR 6-Band EQ covers all the essential guitar frequencies, with each slider ready to deliver +/-18dB of cut or boost for incredible control over your sound. This pedal is ideal for creating scooped-mid rhythm tones with massive low end. It can also add natural sounding warmth to a quacky acoustic pickup and eliminate onstage feed-back. You can also use the 6-Band EQ in the effects loop of your amp for a huge, sculptable lead boost.Power: Dunlop ECB003 AC Adapter or Single 9 volt battery