Rechargeable via USB charging cable: Our guitar tuner is built with a rechargeable battery inside, never needs a button battery replacement, and is also very environmentally friendly. Charges quickly with the included USB cable on your PC or mobile power bank and goes over 10 hours of continuous use after a single charge! The violin tuner saves energy with automatic Power-Down after 5 minutes without signal.Note Key Function: The clip on guitar tuner has a note key function that meets the needs of most professional guitarists. When the device is in G(Gitar) tuning mode, briefly press this button to switch between guitar tunings (DROP D, OPEN G, OPEN D, OPEN D, OPEN E) and flat tuning (b,bb). With this feature, there are more songs you can play.High sensitivity and incredible accuracy; Highly sensitive vibration-based tuning ensures your instrument is tuned accurately even with background noise. Not like other cheap tuners, this guitar tuner reads the low E string of bass guitar quickly and flawlessly without blowing all on and off.Compact size and large screen: The ukulele tuner is almost frameless with a large color LCD display making it super easy to read even in a dark environment. With 360 degree rotating clip, you can position the screen any way you want. The tuner clamp is well designed and small enough to fit exactly in your pocket or in the end of the guitar case.Great Gift for Stringed Instruments Players: This violin tuner features four tuning modes (Chromatic, Guitar, Violin, Ukulele) covering a wide range of instruments including mandolin, banjo and almost all acoustic and electric string instruments. Packed in an elegant gift box to surprise the one you love!