Features: Smart Tuner + String Winder: 2-in-1 multi-functional string instrument tool for string instrument players. It makes guitar or ukulele tuning easier, more time-saving and convenient to use. A must have for beginners or professionals. 3 Tuning Modes Switchable: Supports auto tuning mode, semi auto tuning mode and custom tuning mode (for acoustic guitar only), different modes designed for optimized tuning experience, which can satisfy all your guitar/ ukulele tuning needs. Wide Range of Use: Suitable for acoustic guitar, classic guitar, electric guitar (guitar-- 6E, 5A, 4D, 3G, 2B, 1E), ukulele (4G/ LG, 3C, 2E, 1A) and chromatic tuning (C, C , D, D , E, F, F , G, G , A, A , B), and with colorful LCD display showing the battery level, string number, target pitch, pitch distance (Lo/ Hi), etc.. Easy-to-Use String Winder: 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; with easy-to-plug peg connector, suitable for different tuning pegs. Strong Endurance & Fast Charging: 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 Tuning Mode: Auto, Semi-auto, Custom (for acoustic guitar only) Guitar: 6E, 5A, 4D, 3G, 2B, 1E Ukulele: 4G/ LG, 3C, 2E, 1A Chromatic: C, C , D, D , E, F, F , G, G , A, A , B 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)