Feature: 1. This is a smart tuner and winder 2 in 1 multifunctional stringed instrument tool, suitable for stringed instruments. 2. The smart tuner supports automatic adjustment mode, semi-automatic adjustment mode and custom adjustment mode, different modes designed to optimize the adjustment experience. 3. Suitable for acoustic guitar, classical guitar, electric guitar, ukulele and chromatic tuning, and has a color LCD display to display the tuning status, which is easy to use. 4. Quick and easy wing, just press the UP/DW button, you can quickly tighten or loosen the strings, saving time and energy; direction indicator allows you to easily confirm the wing direction. 5. This guitar tuner has a built-in 2600mA lithium battery that can be charged via the included USB cable, and the charging indicator lets you know the current battery capacity. Specification: Item Type: Guitar Smart TunerColour: Black Material: Metal + plastic Battery: 3.6V Lithium battery/2600mah Power Supply: For Android USB1.0A(1). Tuning Mode Instrument Selection Tuning Automatic Wooden Guitar 6E,5A,4D,3G,2B,1E Electric Guitar Classical Guitar Ukulele 4G,3C,2E,A 12 Average Law CC( ),DD( ),E,FF( ),GG( ),AA( ),B (2) Tuning Mode Instrument Selection Tuning Semi-Automatic Wooden Guitar 6E,5A,4D,3G,2B,1E Electric Guitar Classical Guitar Ukulele 4G,3C,2E,A (3) Tuning Mode Instrument Selection Tuning Special Tuning Wooden Guitar 6th E,D ,D,C ,C 5th A,G ,G 4th D,C ,C,D ,D,E 3rd G,F ,F 2nd B,A ,A,C 1st E,D ,D Package List: 1 x Smart Tuner1 x Head1 x USB Cable