ERNIE BALL POWERPEG PRO 9626 Electric Tuner Winder for Guitar and for String Change and Maintenance Bass,

This electric peg winder features a versatile design that is compatible with not only acoustic guitars, electric guitars, and bass guitars, but also mandolins, ukuleles, and vintage basses. It is powered by a lithium-ion rechargeable battery that can be quickly charged using the included USB-C cable. Compared to manual string changes, string changes take up to 80% less time. Designed to fit comfortably in the hand and reduce fatigue even when working for long periods of time. Comes with a lock function to prevent accidental operation when carrying or storing.