GMT-4 General Metronome & Tuner Scale:Chromatic,Guitar,Bass,Violin,Ukulele Tuning Range: A0(27.5Hz)~C0(4186Hz) Calibration: 430Hz~450Hz Precision: 1cent Flat:b,bb,bbb,bbbb(in Guitar and Bass mode) Beat:0~9 Rhythm:1~8 Tempo:30~280bpm Power:3V (AAA*2)