Feature: 1. 【Efficient and Time-saving】: Our guitar string winder is designed to make the process of replacing strings quick and easy. With a high-speed motor that operates at 180rpm, you can swiftly wind or unwind your guitar strings in no time. 2. 【Versatile and Convenient】: This automatic guitar tuner is suitable for both guitars and ukuleles, making it a versatile tool for musicians of all levels. Its compact and lightweight design allows for easy portability, so you can take it with you wherever you go. 3. 【User-friendly Features】: Say goodbye to string winding confusion with our considerate design. The grippable body ensures a comfortable and tight grip, ensuring smooth winding and unwinding. Additionally, our long-lasting rechargeable battery provides hours of usage time, and can be conveniently charged through the mini USB charging port. 4. 【Adjustable Speed Gears】: Our guitar string winder tool features two adjustable gears, allowing you to control the winding speed according to your preference. The first gear operates at 130rpm, while the second gear provides a faster winding speed of 180rpm. 5. 【Reliable and Sturdy】: With a powerful motor and a sturdy construction, our automatic guitar winder is built to last. The battery capacity of 1000mA ensures a reliable performance, while the USB C charging port offers convenience for charging. Invest in this reliable and durable guitar tuner winder to enhance your playing experience. Specification: Battery Capactiy: 1000mA Charging Time: 2hr Usage Time: 3hr Charging Port: USB C Type .Number of Gears: 2 Adjustable Gears 1st Gear: Winding Speed is 130 rpm 2nd Gear: Winding Speed is 180 rpm Product Color: Black, White (optional) Product Size: 6 * 2.5 * 10cm/2.4 * 1 * 3.9inch Storage Bag Size: 8 * 12 * 4.5cm/3.1 * 4.7 * 1.8inch Package List: 1 * Guitar String Winder1 * Charging Cable1 * Storage Bag1 * Instruction Manual