[DISCONTINUED] Vox Joe Satriani Big Bad Wah Pedal Dual-mode design offers two distinct wah sounds in a single pedal Wah One is classic VOX; with that decidedly sweet UK tone Wah Two provides Joe Satriani's original drive and voice controls, delivering a wide range of sound-creation possibilities Battery life: approximately 90 hours (when using zinc-carbon battery) Power Supply: 9V battery(6F22, 6LF22/6LR61) or AC adapter(sold separately)