Features: Effortlessly restring guitars and ukuleles with this electric string winder featuring an automatic winding mechanism, saving 70% time compared to manual tools while ensuring precise tension control. Crafted with durability plastomer housing and an ergonomic nonslip grip, this USB rechargeable device delivers smooth operations with its battery offering 8+ hours of continuous use. Ideal for guitarists, music teachers, and ukulele enthusiasts seeking professional grade maintenance tools to instrument care between rehearsals or live performances. Perfect for quick string changes, backstages preparations, or home practice, its compact design fits seamlessly into instrument cases for on the go accessibility. Compatibility with acoustic/classical guitars, bass guitars, and mandolins, this multi instrument string winder maintains optimal neck alignment during restringing to preserve instrument integrity. Specifications: Color:Two Choices Dimension:12x9.5cm/4.72×3.74in Component:plastomer Package Includes: 1pc electric Guitar string reel note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.