Sabbadius Custom Pedal Effects Mr. White 2 Booster Crank Up: is the knob that switches the "Drive" which gives the saturation sound. Master Output: volume knob or exit of saturation Their may be supply by a 9 volt battery or power NEGATIVE center polarized 200m.a 9 volt. Color: White Measurements: 120mm long (4.6inch)x 80mm ( 3.2inch) wide x 40mm (1.6inch) high. Approx.: 800gr.