Here is the official description of the Dunlop Crybaby 105Q Bass Wah:
The Dunlop Crybaby 105Q Bass Wah Pedal is a wholly unique effect masterfully applied to bass. Adds a growling, funky new dynamic to your sound. Customized circuit for the bass guitar, a 100kOhm Hot Potz potentiometer, sturdy die-cast body, and a Q dial lets you alter the wah parameters. The Dunlop Crybaby 105Q Bass Wah Pedal is powered by the Dunlop ECB03 AC adapter and/or 9V battery, not included.
I found a interesting video by happyslappysoong:
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