The QChord is a state-of-the-art, portable, self-contained instrument. It uses the latest microprocessor technology to deliver incredible sound and myriad playing options. Developed by Suzuki, makers of the Omnichord, digital pianos, and many other musical instruments, it combines features of an autoharp, piano, guitar, and other musical instruments, in digital form. One finger is all it takes to play beautiful music. Try any of the interchangable digital song cards. Battery power or A/C adapter capable.