ammoon AROMA AT-102 Rechargeable Rotatable Clip-on Electronic Tuner Color Screen with Built-in Battery USB Cable for Chromatic Guitar Bass Ukulele Violin Compact clip-on tuner for chromatic/ guitar/ bass/ ukulele/ violin. 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.