Six bands, each based one octave apart with boost and cut 18 dB on each band. Equalizes complete response range from electric guitar to bass - 100Hz to 3.2kHz. Also great for pickups on acoustic guitars. The M-109 is very quiet in operation and the positive feel of the sliders means that your chosen frequency curve will keep its shape. In short, the M-109 does its job quietly and efficiently. Features: Six variable slide pots. Powered by the Dunlop ECB-200 AC Jump and/or one 9volt battery.