Features: Smart tuner + string winder 2-in-1 multi-functional string instrument tool for string instrument players. Supports auto tuning mode, semi auto tuning mode and custom tuning mode, different modes designed for optimized tuning experience. Suitable for acoustic guitar, classic guitar, electric guitar, ukulele and chromatic tuning, and with colorful LCD display showing the tuning status, convenient to use. Fast and easy wingding, just press the UP/DW button, then you can tighten or loosen the strings quickly, save time and energy; direction indicators allow you to confirm the wingding direction easily. Built-in 2600mA lithium battery, which can be recharged by the included USB cable, and the charging indicator let you know the current battery capacity. Specifications: Color: Black Power Supply: 1 * 3.6V 2600mA Rechargeable Lithium Battery Charging Time: 2H Charging Cable: Micro USB 5pin 5.2V DC 1.0A Current: stand by 16mA, motor tuning 250mA Item Size: 11 * 9 * 3.6cm/ 4.3 * 3.5 * 1.4in Item Weight: 213g/ 7.5oz Package Size: 16.2 * 13 * 5cm/ 6.4 * 5.1 * 2in Package Weight: 328g/ 11.6oz Note: The guitar showed in the picture is not included. Package List: 1 * Tuner 1 * Extra Peg Connector 1 * USB Charging Cable 1 * User Guide(English)