SE-GEQ is the 8 band-Equalizer with Chromatic Tuner. When pushing the Tuner Switch, the SE-GEQ becomes a Pedal Tuner. You can choose True Bypass or Tuner system with Foot Switch. When tuning, the noise is perfectly blocked by Low-Impedance Mute of output. When pull up the Tuner Switch, this becomes a 8 band-Equalizer. You can choose Bypass or Equalizer system with Foot Switch. Specs: Power supply: DC9V, Consumption: 22mA(EQ mode), 27mA(Tuner mode), 19mA(bypass), Dimension: 75.5(w) x 115.5(h) x 47.5(d) (mm), Weight: 290g (include battery)