Worked as Tuner & Metronome, good helper for novice. Small and exquisite appearance, it is convenient to carry. Super bright backlight, LCD display(3.7 x 2.3cm), it can provide excellent visibility. 360 degree rotatable clip, it can adjust at your suitable angle, simple and practical. With a clip, it is easy to fix on the instrument. Auto power off function, the device turn off automatically if there is no signal present or operation in 5mins. It can be used for the tuning of guitar, chromatic, bass, violin and ukulele C. material: plastic Tuning Accuracy Indicator: Low: The indicator points to the left, showing orange; High: The indicator points to the right, showing orange; In tune: The indicator points to the middle, showing green. Color: Black Turning items: Chromatic, Guitar, Bass, Violin, Ukulele C Tuning range: A0(27.5Hz)-C8(4186.0Hz) A4 frequency: 430-450Hz Beat:0-9 Tempo:30-250bpm Precision:+-1 cent Power: 1 x CR2032 battery (Battery not include) Power consumption: Turning mode: less than 12mA; Metronome mode: less than 20mA Display size: .3.7 x 2.3cm/1.5 x 0.9in Package List: 3 x Electronic tuner 3 x User manual (English) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.