The daddario eclipse rechargeable tuner is all you need to keep a multitude of stringed instruments performing to their best'. '.strtoupper('e')asy to use and with a minimum of fuss this handy chromatic tuner clips onto your equipment and swivels to whatever angle you need'. '.strtoupper('i')t works by reading vibrations rather than sound ensuring pinpoint accuracy and rapid speed for your tunings thanks to daddarios excellent processor'. '.strtoupper('w')hats more is that youll never have to bother with finding replacement batteries as the eclipse comes installed with a rechargeable battery and a provided usb b cable allowing up to 24 hours of use'. '.strtoupper('e')ven better automatic power off function preserves the battery life after youre finished tuning meaning the eclipse is always ready to get your pitch sorted!