Features: Guitar chord tool + tuner + metronome + tone generator, 4-in-1, with powerful functions and easy operations. 6 types of chord (major/minor/7/9/major7/minor7) and 372 chord hand positions, more accurate tuning. Supports guitar tuning via built-in mic or 6.35mm input jack, with guitar chromatic tuning modes. 3 measurement voice for helping you keep track of beats easily in the metronome mode. With built-in lithium battery and can be charged via the included USB cable, suitable for long time usage. Large LCD display and foldable stand design for easy viewing and operation. Other features: 3.5mm headphone 6.5mm output jacks, volume gain control knobs, LED indicators and speaker.