The Pitch-key is a  preset alternative tunings for Electric and Acoustic Guitars. The Pitch-Key attaches to any string in between the nut and the tuning post of your guitar. It allows you to preset two different pitches for that string and to quickly switch between those pitches by rotating the thumb-wheel. It can be fitted and removed in seconds. You don't even need to remove the string! Pitch-Key is capable of de-tuning and re-tuning the string very accurately, provided that your guitar has accurate intonation, the strings are properly stretched in and that the string is not binding in the nut.