AMT-100 rechargeable clip-on tuner/ metronome for chromatic/ guitar/ bass/ ukulele/ violin has a unique function of rotary to switch modes automatically. Features: Can be used as a tuner or metronome rotary 180° to switch modes automatically. With built-in rechargeable battery can be charged via the included USB cable easily. Adopts high definition color screen to make operation easier and clear. Support users setting memory function. Very flexible to change angles for better reading information. Can be place in front or on rear of the instrument. Suitable for chromatic/ guitar/ bass/ ukulele/ violin tuning. Specifications: Brand: Eccouum Model: AMT-100 Color: Black Tuning Items: Chromatic(C)/ Guitar(G)/ Bass(B)/ Ukulele(U)/ Violin(V) Tuning Detection : A0(27.5Hz)-C8(4186.00Hz) Tuning Mode: Clipping on instrument by picking up vibration only Tuning : 430Hz-450Hz Tuning Accuracy: ±0.5 cent Metronome Tempo : 30bpm-260bpm Beats: 0/ 1/ 2/ 3/ 4/ 5/ 6/ 7/ 8/ 9 Power Supply: Rechargeable built-in battery 3.7V/ 110mAH Item Weight: 28g / 1oz Package Size: 12 * 5.5 * 3.5cm / 4.7 * 2.2 * 1.4in Package Weight: 61g / 2.2oz Note: Please operating it at a suitable distance from radio television and other electrical devices. Package List: 1 * Tuner 1 * USB Cable 1 * User Manual (English & Chinese)