Features: 1.TUNING PROGRAM: 12 equal temperament, guitar, violin, bass, ukulele. Tuning range: A0(27.5Hz) to C8(4186.01Hz). 2.LCD DISPLAY: Easy to read and operate, clear LCD digital display, easy to read, automatically turns off when not in operation, turns off automatically within 5 minutes. 3.PRECISE TUNING: The clip on tuner provides precise tuning for guitars, basses, violins and ukuleles, ensuring your instrument is always in tune. 4.CLIP ON: The Acoustics calibration tuner features a clip on design that easily attaches to the instrument and detects pitch directly from the instrument's vibration without interference from room noise. 5.LONG BATTERY LIFE: The tuner is powered by a 3V CR2032 coin cell battery, which provides long battery life and ensures that you'll be tuning your instrument for a long time. specification:Item Type: Clip On Tuner Material: ABS Tuning Items: 12 Equal Temperament, Guitar, Violin, Bass, Ukulele Tuning Range: A0-C8 Battery Type: 3V CR2032 Button Cellx1 (Shipped Without Battery) Color: Red PackageList:1 x ClipOnTuner(ShippedWithoutBattery) 1 x Instruction Manual