The Cherub 3 in 1 Metrotuner has an extra-large backlit LCD display with lights that turn green when in tune. The tuner tunes chromatic, guitar, bass (low D to high C) violin, C ukulele and all wind instruments. It also tunes down to 4 flats. It has an A4 range of 430-450 Hz, a 2A to 6A tone generator plus guitar, bass, violin and C ukulele and a metronome tap tempo of 30-250 bpm. The metronome also has 9 beat settings, 8 rhythms and a large speaker with volume control. The tuner has a built-in mic and sockets for earphones and inputs.