This crowdfunded pen is also a guitar, charger, and music player

As fans of old delta blues will already know, even two or three strings on a guitar can be too many when belting out soulful music on a guitar-like instrument. Rather than changing the pitch of a long piece of tuned wire with a glass bottle or steel blade though, the FretPen uses technology to offer players three full octaves from just three frets on a real wood neck and a companion iPhone app. Oh, and it’s also a pen.