Rechargeable via USB charging cable: Our guitar tuners have built-in rechargeable batteries, no need to replace coin cell batteries, and are very eco-friendly. Quickly charge your PC or power bank with the included USB cable for over 10 hours of use on a single charge. The violin tuner automatically shuts down after 5 minutes of no signal to save power. Note Function: The clip-on guitar tuner has a note function to meet the needs of most professional guitarists. When the unit is in G (guitar) mode, press this button briefly to switch between guitar tuning (DROP D, OPEN G, OPEN D, OPEN D, OPEN E, OPEN E) and flat tuning (b, bb) switch. With this function, you can play more songs. High Sensitivity and Incredible Accuracy: High-sensitivity vibration tuning ensures your instrument is tuned precisely in the blink of an eye, even in the presence of a noisy background. This guitar tuner reads the low low E chord quickly and flawlessly. dark. With the 360-degree swivel clip, you can place the screen anywhere you want. Tuner clips are well designed and small enough to fit in a pocket or on the end of a guitar case. GREAT GIFT FOR STRING INSTRUMENT PLAYERS: This violin tuner has four tuning modes. Tunings (chromatic, guitar, violin, ukulele) cover a wide range of instruments, including mandolins, banjos, and almost all acoustic and electric stringed instruments. Surprise your loved one in an elegant gift box.