Features: Smart tuner and 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 or 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 x 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 x 9 x 3.6cm or 4.3 x 3.5 x 1.4in Item Weight: 213g or 7.5oz Package Size: 16.2 x 13 x 5cm or 6.4 x 5.1 x 2in Package Weight: 328g or 11.6oz Note: The guitar showed in the picture is not included. Package List: 1 x Tuner 1 x Extra Peg Connector 1 x USB Charging Cable 1 x User Guide(English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.