Product description: Quantity: 1 piece Color: Black Product name: guitar tuner. Size: 3.2cm * 4.7cm * 5cm Adjustment error: +0.5 cents Power supply: CR2032 button battery (not included) Tuning elements: equal temperament, guitar, bass, violin, ukulele, banjo Instrument tuning Chromatic, guitar, bass, violin, ukulele, banjo and wind instrument in the key of F, Bb, Eb. Perfect tuner for your stringed instruments. Easy to use, clip-on styleSmall size with buttons to control, very easy to use Clip-on tuner with 360 rotation 360 degree rotation allows this tuner to be rotated to any desired angle. A high-contrast tuner with a clear LCD display provides excellent visibility. Fast and Accurate Tones are measured by determining the vibration frequency, which is more precise. The tuning range is from A0 (27.5 Hz) to C8 (4186.01 Hz). Auto power off function The ultra-low power and power off function Automatic saves power and extends battery life.