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. Extremely quick progression with a proven, effective, system, suitable for all ages. The chord conversion efficiency is improved, and the playing is smoother. This version of the practice aid does not currently work on left-handed, 12-string, classical or half-sized guitars. Just press the buttons play!works on acoustic &Classical&electric guitars. The Strings 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 plan and within a few weeks, youbegin removing some of the tabs andmaking the chords on your own.