Eno ET-09 Rechargeable headstock Guitar tuner Clip on (red) 360 rotation, Tuning range: A0 (27.5Hz)-C8 (4186Hz); Built-in 3.7 volt rechargeable lithium battery (USB cable included) multi instrument tuner, suitable Guitar, Bass, Ukulele, Chromatic;Under Guitar & Bass Mode with flat function A4 Frequency 430-450 Hz; Black and white LCD display with green back-light; Clip on headstock tuner, precise vibration detection, fast response; Robust compact design and easy-to-read LCD display, Cola Red style finish Tuning for: Chromatic, Guitar, Bass, Ukulele,ect; Easy to read: Black and white LCD display with green backlight; A4 Frequency: 430 Hz- 450 Hz Flat for tuning Guitar and Bass:, Tuning range: A0(27.5Hz)~C8(4186Hz) Mini size clip on vibration sensor tuner Precision: 1Cent Power By:Built-in 3.7 volt rechargeable lithium battery (Standard USB cable included.) (<span class="a-text-bold">Caution:Please charge the power before use. Power adapter standard: DC 5V, 500-1000mA</span>) Press about 3 Seconds to Power ON / OFF Slightly type the button to choose the tunning mode C/G/B/U (C-Chromatic, G-Guitar, B-Bass,U-Ukulele) Press MODE button about 2 seconds to adjust the A4 Frequency Rotate 360, easy to read from any angle Available color: Black(ASIN:B019XIOOME), Blue(ASIN:B017AVKU5Q), Red(ASIN: B0179BJX78), please choose the right color you prefer 1*ET-09 Tuner 1*User Manual 1*Standard USB Cable Size:56*30*45 MM Weight: 42.5 G