Specification: Item Type: Guitar Accessories Kit Material: Steel + Copper + Plastic + Celluloid Tuner Power Supply Type: CR2032 Button Batteryx1 (Delivered With Matching Battery) Battery Capacity: 240mAh Package List: 18 x Guitar String 15 x Guitar Pick 6 x Pure Copper Solid String Cone 1 x Capo 1 x 3-In-1 String Changer 1 x Piano Cloth 4 x Guitar Finger Cot 2 x String Pillow 1 x Guitar Pick Bag 1 x Tuner 1 x Button Battery 1 x Chinese And English Manual How to Use: How to Use the Tuner: 1. Please press and hold the power button for 2 seconds to turn on the power. If you press and hold the switch again for two seconds, you can turn off the power. 2. Please repeatedly tap the power button to select the tuning item you need. When you press this button repeatedly, the screen will display C (Chromatic/Twelve equal temperament), G (Guitar/guitar), B (Bass/bass), V (iolin/violin 1, U (Ukulele/Ukulele) Lili). 3. Clamp the tuner to a place where the vibration of your instrument is obvious. 4. Let your instrument sound a single note, and the note name of that note or the string sequence name it represents will be displayed on the screen. The screen color and tuning pointer will change accordingly. The screen turns green and the pointer stays in the middle position: the tuning is correct. The screen remains white and the pointer points to the left or right: the pitch is low or the pitch is high.