Rechargeable via USB Charging Cable: Our guitar tuner is built with a built-in rechargeable battery, it never needs a button battery to replace and it's also very eco-friendly. Recharges quickly with the included USB cable on your PC or power bank, lasts for over 10 hours of continuous use on a single charge. The violin tuner saves power with auto power off after 5 minutes of no signal. Note Tone Function: The clip-on guitar tuner features a note tone feature that meets the needs of most professional guitarists. When the unit is in G (guitar) mode, short press this button to switch between guitar tunings (DROP D, OPEN G, OPEN D, OPEN D, OPEN E, OPEN E) and flat tuning (b, bb ). With this feature, there are more songs you can play. High Sensitivity & Incredible Accuracy: Highly sensitive vibration tuning ensures your instrument is tuned precisely in the blink of an eye, even in the presence of background noise. This guitar tuner reads the bass low E chord quickly and perfectly. Compact size and large display: The ukulele tuner is almost frameless with a large LCD color display, which makes it great easy to read even in dark environment. With a 360 degree rotating clip, you can position the screen as you wish. The tuner clip is well-designed and small enough to fit right in your pocket or on the end of the guitar case. Great Gift for Stringed Instrument Players: This tuner Violin Tuning features four tuning modes (Chromatic, Guitar, Violin, Ukulele) covering a wide range of instruments, including mandolins, banjos, and nearly all acoustic and electric string instruments. Packaged in an elegant gift box to surprise the one you love.