3 in 1 Multifunction Guitar Tuner : -Tuner Mode A4 frequency : 430~450Hz Suitable for a variety of tuning mode: C(Chromatic), G(Guitar)B(Bass)U( Ukulele C) V(Violin). Each shutdown can automatically save the current parameters. Will turn off automatically if there is no signal present or operation in 5mins. When it is in tune, the LCD backlit turns to green. When it is sharp or flat, the LCD backlit turns to orange. -Tone Generator Press power key briefly to start the TONE GENERATOR, playing the selected note. - Metronome The TEMPO : 30-250bpm Beat : 0-9 8 rhythm types Press and hold Rhythm key to adjust the volume Press power key to play / stop the metronome Specifications Turning items: Chromatic, Guitar, Bass, Violin, Ukulele C Tuning range: A0(27.5Hz)-C8(4186.