feature: Mini clip-on tuner, suitable for bass, guitar, violin, chroma, ukulele and some other stringed instruments. 360rotating design, easy to use-place the tuner where the vibration is most obvious. It has an automatic shutdown function when there is no operation for about 5 minutes to extend the battery life. Easy to operate-when tuning, the string number and note name will be further displayed on the LCD screen; two-color backlight, green for dimming, and blue for dimming. The last parameter setting will be automatically stored at startup, and the initial setting will be automatically restored after reinstalling the battery. Product Name: Guitar Tuner Material: abs Colour: Black Height: 8cm Tuning: chroma, guitar, bass, ukulele, violin Tuning method: pickup Tuning range: A0 (27.5Hz)-C8 (4186.0Hz) Tuning accuracy: 1 minute Calibration: A4 = 430-450Hz Power supply: 1 * CR2032 (not included) Size: 50mm*40mm*26mm*13mm Quantity: 1pcs (including button battery)