Product name:Guitar Chord Trainer Product size about : Ordinary folk guitars can be used from 38 inches to 42 inches, regardless of brand. Classical guitars and ukuleles cannot be used.used Product color: As shown in the figure Product material:ABS product features: Instructions for fingering buttons: D=Dm+D, press two buttons together for D; F=blank key+F＋AM7, press three together for F; Bm=Dm+D+BM; C=C+AM7, press two together for C chord, AM=AM+AM7, press two together for AM chord, and the others each button represents one chord. Precautions: 1. Guitar Chord Trainer: This guitar chord trainer is a must-have for beginners learning to play the guitar, especially for those interested in folk and acoustic music. It helps users quickly master chords and strumming patterns, making it easier to play popular songs. 2. Easy Chord Transition: The guitar chord trainer features an automatic chord transition function that allows users to switch between chords with a simple press of a button. This makes practicing chord changes more efficient and enjoyable for novice players. 3. One-Touch Chords: The one-touch chord feature enables users to play various chords effortlessly, eliminating the need for complex finger placements and enhancing the learning experience for those new to the instrument. 4. Practice Aid: Whether practicing alone or with others, the guitar chord trainer serves as a helpful tool for honing chord skills and developing a repertoire of songs, making the learning process more engaging and rewarding for aspiring guitarists. Package includes: 1 pc Guitar Chord Trainer