<p>Features:</p> <p>Easy to change the strings, clockwise or counterclockwise switch to control string tension.</p> <p>Easy to operate, saving time and effort.</p> <p>Built-in rechargeable li-ion battery, charge via included USB cable.</p> <p>Compact and lightweight, 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 effort. It is suitable for folk guitar, acoustic guitar, electric guitar, etc.</p> <p>Suitable for folk guitar, acoustic guitar, electric guitar, etc.</p> <p>Specifications:</p> <p>Winding Speed: Max. 150KHZ</p> <p>Overcharge conservation Voltage: 4.3V</p> <p>Working Voltage: 2.7-4.3V</p> <p>Battery: Li-ion 3.7V 800mah</p> <p>Working Speed: 5rpm\/s</p> <p>Charge Time: 2-5h</p> <p>Item Size: 120 x 100mm \/ 4.72 x 3.94in</p> <p>Color: White</p> <p>Material: ABS</p> <p>Package Contents:</p> <p>1 x Electric guitar string winder</p> <p>1 x Charging cable</p> <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> <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.</p>