This miniaturized version of the Tonemaster boasts glorious tone for its size, along with authentic looks to match. This portable mini amp features classic details reminiscent of the original Tone-Master, from metal amp corners to vintage-style brown grille cloth and white knobs. One 9 volt battery or DC 'wall wart' adapter required to power up. This miniaturized version of the Tonemaster boasts glorious tone for its size, along with authentic looks to match. This portable mini amp features classic details reminiscent of the original Tone-Master, from metal amp corners to vintage-style brown grille cloth and white knobs. One 9 volt battery or DC 'wall wart' adapter required to power up.