The MXR M109S EQ pedal offers 6 bands covering all the essential guitar and bass frequencies, with each slider providing 18 dB's of cut or boost, allowing you to create scooped mids or massive lows you never thought you could produce. It’s also great for adding warmth to a quacky acoustic pickup for a more natural sound, and instantly eliminating onstage feedback. You can use it to boost your overall signal when using a long effects chain. With redesigns that include a rugged bypass switch and "positive feel" illuminated sliders., the M109S is powered by a single 9 volt battery or Dunlop ECB-003 AC adapter.