Specifications: Undoubtedly that it is attached securely on the neck of your guitar over the first three frets. It rests on three legs that have rubber caps on the ends to protect your guitar. The two legs at the front of that will stand between strings 1 and 2 and strings 5 and 6. It is important that the legs do not interfere with these vibrating strings. Therefore, you must make two measurements on your guitar to make sure that they will fit properly: First, the vibrating string length should be 24 inches to 26 inches. Second, the distance between strings 1 and 6 directly above the third should be one and a half inches to one and five eights inches. There is no doubt that this guitar learning aid can be convenient for beginner to learn guitar and recognize the guitar chord, since it has color mark and ergonomic design. When it is properly installed, and no buttons are pushed down, there will be no interference with the vibrating strings. With the 18 buttons, over 110 chords are available. These include all the basic chords for the guitar keys of C, D, E, G and A. You also have the full scales of C and F In the chord diagrams, which are included. Sometimes two or more buttons are simultaneously pushed down with the same finger. For example, the A chord is produced by pressing three buttons with a single finger. This makes playing with the easier. If you plan to ultimately transition from them, you should use the normal fingering as found in standard chord diagrams. The product features with portable owing to its compact size and lightweight body. Made of high-quality plastic and electronic components, it can be used for long-term use. The length of guitar aid is 10.6cm, the width is 5.2cm, and the height is 2.2cm. This product is suitable for those who have finger pain, string buzzing, or develop finger calluses when fretting the strings directly. Item Name: Guitar Aid Material: Electronic Component Features: Minimalistic, Ergonomic, Creative Application Scope: Folk Guitar (38 Inches - 41 Inches) Size Details: Guitar Aid: 10.6cm x 5.2cm x 2.2cm/4.17" x 2.05" x 0.87" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Guitar Aid 1 x Guitar Chord Chart