Multi-functional Wah-Wah pedal?offers 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 Additional Fine Tune control allows high-end extension of sweep range for incredibly bright, ultra-present tone Ultra-musical Q control for precise filter shaping to achieve vocal-like effects Tunable boost function including On/Off switch to push your licks up to the limit Dual LED indicators for Effect On/Off and Boost On/Off at the tail of the pedal for total control Ultra-low noise circuitry for outstanding audio performance Runs on 9 V battery or the BEHRINGER PSU-SB DC power supply (not included) High-quality components and exceptionally rugged construction ensure long life Conceived and designed by BEHRINGER Germany