Multi-function Electric String Winder String Cutter USB Rechargeable Portable for Guitar Ukulele (Orange) 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 + Metal Color: White, Orange (optional) Winding Speed: Max. 150KHZ Overcharge conservation Voltage: 4.3V Working Voltage: 2.7-4.3V Battery: Li-ion 3.7V 800mah Working Speed: 5rpm/s Charge Time: 2-5h Item Size: 120 * 100mm / 4.72 * 3.94in Package Weight: 250g / 8.82ounces Package Size: 150 * 120 * 40mm / 5.91 * 4.72 * 1.57in Packing List: 1 * String Winder 1 * USB Cable