Large screen clearly displays chord name, fingering chart, metronome and chords number, more humanized, clear at a glance.;6-fret with open-close protective cover for convenient use and safe storage, and is portable to carry anywhere.;Chord mode: practice chord according to your choice at wish, which is more specific and personalized.;Cycle mode: practice stored chords circularly by following metronome that can be adjusted.;Powered by 3V button battery (not included), it will automatically shut down after 5min idle time to save energy.