Compact size clip-on tuner One-button operation, easy and convenient to use. LCD display, 2 colors backlight: green- in tune, white- out of tune. Rotatable design, allows you to have the best viewing angle. For helping you to find the accurate tuning of your instrument. Model: AT-01A Tuning Items: Chromatic(C)/ Guitar(G)/ Bass(B)/ Ukulele(U)/ Violin(V) Pitch Range: 440Hz Tuning Accuracy: 0.5 cent Power Supply: 1 * CR2032 Battery (not included) Item Weight: 18.5g / 0.7oz Note: The instrument showed in the picture is not included. colour:black Material:ABS size:5.5 * 4.5 * 3.5cm Package Contents: 1 * Tuner Only the above package content, other products are not included. Note: Light 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.