Quickly charge on your computer or power bank using the included USB cable and it will last for over 10 hours on a single charge! The violin tuner saves energy by automatically powering off after 5 minutes of no signal. -The clip on guitar tuner has note key function to meet the needs of most professional guitar players. When the device is in G (guitar) tuning mode, short press this button to switch between guitar tuning (DROP D, OPEN G, OPEN D, OPEN E) and flat tuning (b, bb). With this feature, you can play more songs. Highly sensitive vibration-based tuning ensures your instrument is tuned quickly and accurately, even amid background noise. Unlike other cheap tuners, this guitar tuner works quickly and perfectly. The ukulele tuner is almost frameless and features a large LCD color display that is very easy to read even in dark environments. With the 360-degree rotatable clamp, you can position the screen just the way you like. The tuner clip is well designed and small enough to fit in your pocket or the end of your guitar case. This violin tuner has four tuning modes (Chromatic, Guitar, Violin, Ukulele) covering a variety of instruments including mandolin, banjo and almost all acoustic and electric string instruments. Comes in an elegant gift box to surprise your loved ones! Note:1. Please allow some defects due to manual measurement.2. Due to different monitors, colors may vary, please understand.If your payment information is incorrect, your order is incorrect.