3 in 1 design: tuner, metronome and tone generator. The largest and unique colorful LCD display ensures easy viewing under any condition. Equipped with 360 degree , it can be adjusted to perfect viewing angle. The opening is anti-slip, and able to onto the instrument stably. Sensitive and accurate tuning for chromatic, guitar, , ukulele and violin. Battery: 2 x AAA Batteries(not included) Tuning Range(HZ): A0(2750Hz) - C8(418600Hz) Product Dimensions (L x W x H): 100x60x36MM/394x236x142Inches colour: black Material: plastic Package Contents: 1 x 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.