Chord trainer helps you practice the chords anytime anywhere without having to carry your guitar with you. With screen to display chords, and protective cover for easy use and storage, it's very humanized and portable. It can be a great choice for guitar beginners. Features: 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 the chord according to your choice at wish, which is more specific and personalized. Cycle mode: practice the stored chords circularly by following the metronome that can be adjusted. Powered by 3V button battery (not included), it will automatically shut down after 5min idle time to save energy. Specifications: Color: Black Material: ABS + Metal Power Supply: 3V Button Battery (Not included) Item Size: Approx. 29 * 5 * 3.7cm / 11.42 * 1.97 * 1.46in Item Weight: Approx. 215g / 7.58oz Package Size: Approx. 31 * 6.5 * 4.5cm / 12.20 * 2.56 * 1.77in Package Weight: Approx. 260g / 9.17oz Package List: 1 * Chord Trainer 1 * Small Wrench 1 * User Manual (English)