100% new and . 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.<br><br>Suitable for folk guitar, acoustic guitar, electric guitar, etc. [Maximum speed] 15KHZ [overcharge protection voltage] 4.3V [Operating voltage] 2.7 - 4.3V [Battery capacity] 800mA.h [Working speed] 5 RPM Colour:White & Orange Material:plastic+metal<br><br>Package Contents: 2 * String Winder 2 * USB cable<br><br>Only 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.