Aroma AMT-560 3IN1 Tuner/Metronome for Chronmatic/Guitar/Bass/Violin/Ukulele Digital Metronome Tuner for Chronmatic/Guitar/Bass/Violin/Ukulele Essential tool for professional and beginner guitarists, bassists and violinists etc.Lightweight and portable, easy to carry in pocket Range: Chromatic, guitar, bass, violin, A4 Calibration Pitch: 430-450 Hz, Tuning Item: b/bb , Tempo: 30-260 BPM Tuning tolerance: +-0.5 cent, Beat: 0,1,2,3,4,5,6,7,8,9 , Size: 100 x 65 x 17mm, Signal Cable Length: 0.9 m, Colour: Black .Voltage Input:( 2 x AAA Battery not included)