Auto Tuner - Tunes in 2 modes - Guitar and Bass. It's already set up to tune 7 - string guitars and 5 - string basses. Instrument input: 1/4" jack, Operation: by cable (jack) or Mic (microphone), LED indicator, Without calibration function, Frequency/Tuning range: 0A - 3A, Accuracy: +/- 5 cent, Comes with a tilt stand, Auto Switch Off function, Power: 2x 1.5 V AAA batteries (are included), Color: black. Dimensions: 105 x 52 x 16 mm, Weight : 40g