Designed with first priority given to the musician"s ease-of-use, the compact Marshall tuner MT-1 is suitable for both guitar and bass, tunes up to 5 semitones flat, supports baritone, 7-string and dropped tunings, has a precision LCD needle meter, an auto power off and a built-in mic for tuning acoustic guitars. Two AAA Batteries are included The MT-1 has the legendary Marshall script logo