Behringer Hellbabe HB01 Ultimate Wah-Wah Pedal with Optical Control Multi-functional Wah-Wah pedaloffers everything you need for all styles and sounds This BEHRINGER product has been designed to compete head to head with leading products on the market Total optical control for wear-and-tear-free pedal operation (no mechanical pots and switches) Unique spring-back pedal mechanism with resistance adjustment for ultimate playing style (option to remove) Heel-down frequency range freely adjustable via Range control (440 Hz to 250 Hz) for use even with bass guitars