The Gold Tone Chromatic Clip-on Tuner is a 360 degree tuner that can be clipped on the headstock (front or back), on the banjo rim, on any acoustic instrument in any location and the display can be adjusted to a perfect upright angle. Settings for Chromatic, Guitar, violin/mandolin, ukelele. A large display and color change when string is in tune. Only 440 HZ so NO chance of pushing a wrong button and being tuned in a higher or lower pitch. In fact it only has one button. Plus it will stay on the instrument selection chosen when turned on and off. Automatic shut-off after 2 minute of non use.