Feature:1. Easy to change the strings, clockwise or counterclockwise switch to control string tension.2. Easy to operate, saving time and effort.3. Built-in rechargeable li-ion battery, charge via included USB cable.4. Compact and lightweight, it is easy to store and carry.5. Suitable for folk guitar, acoustic guitar, electric guitar, etc.Specification:The electric string winder is easy to change the strings, easy to operate, saving time and effort. It is suitable for folk guitar, acoustic guitar, electric guitar, etc.Features:Easy to change the strings, clockwise or counterclockwise switch to control string tension.Easy to operate, saving time and effort.Built-in rechargeable li-ion battery, charge via included USB cable.Compact and lightweight, it is easy to store and carry.Suitable for folk guitar, acoustic guitar, electric guitar, etc.Specifications:Material: Plastic + MetalColor: White, Orange (optional)Winding Speed: Max. 150KHZOvercharge conservation Voltage: 4.3VWorking Voltage: 2.7-4.3VBattery: Li-ion 3.7V 800mahWorking Speed: 5rpm/sCharge Time: 2-5hItem Size: 120 * 100mm / 4.72 * 3.94inPackage Weight: 250g / 8.82ouncesPackage Size: 150 * 120 * 40mm / 5.91 * 4.72 * 1.57inPacking List:1 * String Winder1 * USB CablePackage List:1 * String Winder1 * USB Cable