Proprietary detector circuit for superior tracking Dual Filter Architecture Full Spectrum Tilt EQ for Clean sound Continuously variable multipole low-pass Filter for Octave sound Gig-saver bypass (signal passes even if your battery dies) Powered by one nine volt battery or optional universal power supply Heavy Duty steel construction Inputs: One 1/4″ jack Outputs: One 1/4″ jack Controls: Engage switch Optional: 9 volt power supply