Boost the volume and shape the sound of any instrument, or switch to turbo mode when playing solos. You can boost up piezo pickups to match regular amplifier inputs. Dedicated Gain, Bass and Treble controls are included for effortless sound shaping. There is a status LED for effect On/Off and battery check, and you can run your PB100 on a 9 V battery or a DC power supply (not included). For absolutely noise-free operation, a first-class electronic On/Off switch is integrated.