Features:100% brand new and unusedTuning modes: auto/manualTuning range: A1 (55Hz) to B7 (3951.07Hz)Reference note: C4 (261.63Hz) to C5 (523.25Hz)Calibration accuracy: ± 1 centSound accuracy: ± 1 centMetronome accuracy: <1%Powered by: X2 AAA batteries(not included)Dimensions: 96mm x 60mm x 13mm (3.8” x 2.4” x 0.5”)Weight excluding batteries: 65gFor use with: almost all instruments like guitar ，bass ，ukulele， violin ，cello，banjor，oud ，viola etc apart from the pianoMetronome ModeQuickly and easily adjust the frequency (bpm) and the number of beats per bar. You will hear a high pitched bleep on the first beat of the bar and a lower one on the remaining beats.Tempo range is 40 – 230 bpmBeat meter is -/4， 1/4， 2/4， 3/4， 4/4， 3/8 and 6/8Tuner ModeDisplays note， calibration， meter and pure third.Select B， C， D， E， F， G， A， Bb， C#， Eb， E# or G#Tuning range is A1 (55Hz) to B7 (3951.07Hz)Calibrate from 435Hz to 445Hz in 1Hz steps