Features: Auto-on Tuner: the tuner will automatic turn on once the clip was pulled out. Digital Display: 1.7-inch Color VA LCD screen displays tuner mode, tuning meter, note, and battery indicator. 4 Tuner Modes: chromatic(C), guitar(G), bass(B), ukulele(U), using the eject pin to switch among this 4 tuner modes by clicking the Reset/Item button softly. Clip-type Tuner: sturdy and flexible clip can fit onto headstock of the instrument firmly. Battery Powered: built-in rechargeable lithium battery, up to 10 hours of continuous use per charge. Applications: suitable for both the experienced and the beginners to do the tone tuning of guitar, ukulele, bass.