Boss TU-3S Floor Tuner, Tuner Pedal, A TU-3 in compact housing, LED meter with 21 segments and adjustable brightness, High Brightness mode, ""Accu-PitchSign"" function, Tuning modes: chromatic, guitar, bass, 7-string guitar, 6-string bass and drop tuning (up to - 6 semitones), DC Out jack to power other pedals, Power supply via 9 V DC power supply (coaxial connection - negative pole inside, not included in the scope of delivery, matching power supply available under Art.#409939#)