Feature:1. RECHARGEABLE BATTERY: The built in rechargeable battery of the guitar tuner allows continuous use of more than 10 hours per charge.2. LCD DISPLAY: Guitar tuner has a high contrast color LCD screen to display the tuning status, bright and clear.3. FLEXIBLE ANGLE: The guitar tuner has a powerful and flexible angle to obtain the best view, provides a comfortable using experience.4. AUTO SHUTDOWN: The guitar tuner has the function of automatic shutdown, which is power saving and could maximize the battery life.5. HIGH ACCURACY: Electronic automatic tuner has high tuning accuracy, with the error of 1 cent, practical and reliable.Specification:Item Type: Guitar TunerMaterial: ABSTuning Range: A0 (27.50Hz) to C8 (4186.0Hz)A4 Value Range: 440HzTuning Items: 12 equal temperament, guitar, violin, ukuleleTuning Accuracy: 1 CentPower Supply: Rechargeable lithium battery (Included)Size: Approx. 49x26x40mm/1.9x1x1.6inWeight: Approx. 20g/0.7oz.Package List:1 x Guitar Tuner1 x User Manual1 x Certificate of Conformity1 x Micro USB Interface Charging Cable