1. CHORD HELPER - The buttons on the top of the Guitar Helper are different Guitar chords (Only helps to learn guitar, if you remove the guitar aid, you may not be able to remember how to play chords.) 2. FINGER PAINFREE - If the beginner guitar player is afraid of finger pain, this guitar chord tool can help you to avoid finger pain, and allow you to correctly connect the hand posture. (Note: This chord tool can take you to learn guitar at the beginning, but later you still need to practice guitar by grinding out the calluses by yourself.) 3. Easy to install: The chord learning tool can be installed just by clamping it on the neck of the guitar. The installation is simple and there is no complicated process. 4. Scope of application:Specially designed for 36-41 inch folk guitar, chord less than 4.5cm, fretboard size isabout 4.3-4.5cm. 5. Applicable to the crowd: One-click easier to understand and remember guitar chords. Easily solve problems such as inability to remember chords, slow chord transitions, and inability to persist with hand pain. Suitable for guitar beginners and all. Colour:Black Material:ABS Package Contents: 1 * Guitar Chord Trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.