Many wahs only sound good when they're moving. The Ernie Ball Wah is designed to sound good regardless of where you have it set. Made from an aluminum alloy casting providing major durability. 12-degree foot sweep with a smooth coated Kevlar drive. True bypass, adjustable on/off switch with a bright LED when on. AC or battery powered. Easy battery access. A/C power jack and 1/4" instrument jacks are all on the back, keeping the Ernie Ball Wah's footprint small.