Light used, This pedal lets you customize and shape the sound of your wah. By a simple turn of the Q dial, you can shape your wah from a narrow, sharp wah to a broad, subtle wah. The Dunlop Crybaby 535Q also offers six guitar wah ranges, a variable boost from 0 to +26 dB and a hard wire on/off switch. Its new custom circuitry consumes less power and eliminates unwanted distortion. The Dunlop Crybaby 535Q is the guitarist's premium do it all wah-wah pedal. Control over every parameter lets you sculpt the effect to your liking. Select the frequency center of the effect, then dial in the breadth (frequency range) to be swept by the pedal's travel. From narrow & sharp to broad & subtle, this clean, noise-free wah puts the control in your hands (and foot). Used by Jeff Beck. The Dunlop Crybaby 535Q is powered by the Dunlop ECB03 AC acapter power supply or one 9 volt battery.The older version (before 12/01) used Dunlop's ECB04 adapter or two 9V batteries.