Features: 1.3 IN 1: Metronome Tuner combines the basic functions of a tuner, metronome, and tone generator for greater ease of use. 2.TUNING PROGRAM: The Guitar tuner metronome features tuning modes for guitar, bass, violin, ukulele, and twelve equal temperament. 3.RAISE TEMPO: The digital metronome tuner features a range of 30 to 250 bpm and a variety of rhythm and tempo patterns to raise your tempo in rich musical styles. 4.ADJUSTABLE RANGE: With an adjustable A4 range of 430Hz to 450Hz, the metronome tuner has you covered whether you're a guitarist, violinist, pianist or brass player. 5.TWO POWER MODES: You can power the digital metronome with AAA batteries x2 (not included) or a DC 6V power supply. specification:Item Type: Metronome Tuner Material: ABS Tuning Items: 12 Equal Temperament, Guitar, Bass, Violin, Ukulele Adjustment Range: 30-250bpm A4 Range: 430-450Hz Power Supply: AAA Batteries x 2 (Battery Not Included) or DC 6V Power Supply PackageList:1 x MetronomeTuner(BatteryNot Included) 1 xUser Manual