Do you want to buy a set of professional but guitar turner? Our product can meet your requirement. materials, safe to use. Good gifts for friends. Various functions, tuning, metronome, tuner. , can be used for a long time. Features -Color: Black -Material: ABS. -Size: About 10.70X6.70X1.70cm/4.21X2.63X0.67in -Battery: 400mAH 3.7V -Range of sound correction: A0(27.5Hz) - C8(4186.0Hz) -Range of A4: 430-450Hz -Velocity: 30-250bpm - This guitar tuner will provide you clear view experience with no shaking or ghosting. - The internal uses vibrations to detect what key you play and will not be affected by external noise making it for every musician. - And the is very convenient,you will easily take it anywhere in your bag. Various functions, can be a tuning, metronome, tuner. - The product will be a good helper soon when you need to take advantage of them for a long time in one way. - The product is made of high class ABS material. And the product has fine craftsmanship. Package list: 1 x Tuner 1 x USB Cable 1 x Audio Cable 1 x Chinese and English Instruction Manual