Features:<p>Easy to change the strings, clockwise or counterclockwise switch to control string tension.<p>Easy to operate, saving time and efcompatible witht.<p>Built-in rechargeable li-ion battery, charge via included USB cable.<p>Compact and , it is easy to store and carry.<p><p>The electric string winder is easy to change the strings, easy to operate, saving time and efcompatible witht. It is suitable compatible with folk guitar, acoustic guitar, electric guitar, etc.<p>Suitable compatible with folk guitar, acoustic guitar, electric guitar, etc.<p>Specifications:<p>Winding Speed: Max. 150KHZ<p>Overcharge conservation Voltage: 4.3V<p>Working Voltage: 2.7-4.3V<p>Battery: Li-ion 3.7V 800mah<p>Working Speed: 5rpm/s<p>Charge Time: 2-5h<p>Item Size: 120 x 100mm / 4.72 x 3.94in<p>Color: White<p>Material: ABS<p><p>Package Contents:<p>1 x Electric guitar string winder<p>1 x Charging cable<p>Due to the lighting problem, there is a slight color difference<p><p>Only the above package content, other products are not included.<p>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.