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 , it is easy to store and carry.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.Suitable for folk guitar, acoustic guitar, electric guitar, etc.Specifications: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 x 100mm / 4.72 x 3.94inColor: orangeMaterial: ABSPackage Contents:1 x Electric guitar string winder1 x Charging cableDue to the lighting problem, there is a slight color differenceOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.