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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.