3 in 1 metronome, digital tuner and tone generator for Guzheng. High-sensitivity vibration tuner responds fast, which ignores background noise, perfect for loud, chaotic environment. Clear LCD screen will give you excellent visual effect. -on Pickup & Built-in Microphone For Tuning & Ease The precise tuner with headphone jack, input jack and volume control and light indicator. Automatic shutdown function: 5 minutes without operation, the machine will automaticlly off. Small and exquisite appearance, convenient to carry. Suitable as a gift for your friends, family or with others. Model: MT-70B Fit: for chromatic; Guzheng tuning: +/- 1 Cent A4 range: 430 ~ 450HZ supply: 2 * AAA batteries (without included) Colour: black Material: plastic Package Contents: 1 * Guzheng Tuner 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.