Compact clip-on tuner for chromatic/guitar/bass/ukulele/violin. One-touch operation, simple and convenient. LCD display, two-color backlight: green for in-tune, white for out-of-tune. Rotatable design gives you the best viewing angle. Helps you find the precise tuning of your instrument. Tuning items: Chromatic scale (C) / Guitar (G) / Bass (B) / Ukulele (U) / Violin (V) Tuning method: Automatic tuning Pitch range: 440Hz Tuning accuracy: ±0.5 cents Power supply: 1xCR2032 battery(Internal battery) Colour:Black Material:ABS Package Contents: 10 x Guitar Tuner 1 x English instruction manual 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.