Twistune™ is designed to attach to specific Gruv Gear products for quick and convenient tuning of guitars, basses and other stringed instruments. Simply insert and twist the connector arm 90 degrees to fasten to a Gruv Gear Kaepo™ or upcoming FretWraps® Pro while attached to your instrument, and you're ready to tune. Make sure your Kaepo or FretWraps Pro is placed on the headstock (behind the nut) and not over the fretboard, so you can tune open strings properly.