Features: - Just press the buttons play works on acoustic & classical & electric guitars. - This version of the practice aid does not currently work on left-handed, 12-string, classical or half-sized (children s) guitars. - Extremely quick progression with a proven, effective, system, suitable for all ages. The chord conversion efficiency is improved, and the playing is smoother. - Start playing from the minute you attach the practice aid to your guitar. Instead of pressing the strings with your left hand, reduce finger pain, Just Press Buttons and Play. - The Chordbuddy learning system helpsyou make the C,D,G, Em chords. Allyou have to do is press the buttonsAs soon as the is properly attached to youacoustic or electric guitar, you will be ableto play music and sound great. Follow theesson Plan and within a few weeks, youbegin removing some of the tabs andmaking the chords on your own. Specifications: Chord : G, C, D, Em Material: Plastic+Rubber Size: 12.2 * 7.2cm Package Included: 1x Guitar Chord Learning System 10 x Picks0.46mm/0.71mm/0.96mm Random style Notes: 1. Manual measuring, please allow 1 ~ 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.