The Ernie Ball PowerPeg is proven to wind your strings up to 70% faster than conventional manual winders. The Powerpeg's portable motorized design is perfect for home, stage, the jam room, or anywhere you need a complete string change. The PowerPeg's compact battery powered design is easily portable making it one of the most sought-after guitar accessories for all guitarists and bassists. The PowerPeg's universal head attachment is perfectly suited to fit all peg heads types including bass, acoustic and electric guitar and other stringed instruments. A custom locking On-Off trigger prevents accidental unintentional operation.