1、Wide Application: This electronic tuner is used for 12 tone equal temperament, suitable for string musical instruments such as guitar, bass, violin, and ukulele 2、High Accuracy Tuning: This professional tuner can ensure accurate pitch correction and ensure that the musical instrument always maintains good sound quality. 3、Simple Operation: This guitar tuner is easy to operate, 440Hz A4 reference frequency, allowing you to quickly tune the instrument without the need for professional skills. 4、Power and Display: This electronic tuner is powered by batteries, making it easy to use at any time, and the clear digital screen ensures intuitive observation. 5、Plastic Material: This portable tuner is made of excellent plastic material, which has good toughness, wear resistance, and provides a long service life. 1 x Tuner Item Type: Electronic TunerMaterial: ABSBattery Type: 1 x CR2032 BatteryA4 Reference Frequency: 440HzTuning Projects: 12 Equal Temperament (C), Guitar (G), Bass (B), Violin (V), Ukulele (U)