FEATURES: - Power Supply: AC: 220-250V DC: 12V (12V Car Battery) Not Included. - TONE CONTROL: The sound amplifying device features separate low and high tone rotary control knobs which lets you adjust the sound of bass and treble range frequency to the acoustic of a particular performance environment. - EQ CONTROLS: The compact and rack mount amplifier has crisp buttons for the audio sources and selector, rotary knob for tone control, mic, aux, and master volume adjustments.