The D Addario Clip-On Headstock Tuner precisely tunes guitars, basses, and other stringed instruments utilizing vibrations rather than sound. Using a highly sensitive piezo censor and large multi-color display, the Clip-On Headstock Tuner allows you to tune easily and accurately in noisy and dimly lit environments where many other tuners fail. The tuner features a flip-up display that automatically powers the tuner on when opened and off when closed. The 360 Degree rotatable display allows for use on right-handed and left-handed instruments. D'Addario tuners are designed by musicians for musicians featuring intuitive features, easy to read display's, and exceptional tuning accuracy.