Features: 1.Guitar tuner and capo 2 in 1 clip, is not only a professional capo, but also a professional tuner. 2.The clip can be used in an environment where there is a lot of noise interference in the school, which can prevent the tuner from detecting falsely. 3.The capo tuner is ensitive and precise, with good anti?interference ability and quick response. 4.Equipped with a large and clear LCD screen, the guitar capo tuner is easy to read and use. 5.This clip clamps tightly and does not fall off easily. It is suitable for acoustic guitars, electric guitars, classical guitars and ukuleles. 6.The contact point between the capo and the instrument is soft cushioned, which provides perfect protection for your instrument. 7.The capo makes full use of the effort-saving arc and the principle of leverage, and at the same time it is easy to hold and has enough clamping force to ensure the pitch. 8.Made of lightweight zinc alloy and ABS materials, it is small and lightweight, making it easy to carry around. specification:Item Type: Guitar Capo Tuner Material: Zinc alloy + ABS Calibration Accuracy: 1 cent Battery Type: CR2032 button battery*1 (3V) (delivered with supporting battery) Battery Capacity: 240mAh How to Use: 1. Install the battery. 2. Lightly press the power button, the LCD will light up in red at this time. After the machine starts: the tuner is in the state of vibration detection. In the power-on state, lightly press the power button to shut down. 3. Select the tuning item: Press the "Item" key in the power-on state to select the tuning item. The initial selection sequence and range of tuning items: guitar (G), bass (B), twelve equal temperament (C), single cycle. 4. Tuning reference frequency adjustment (A4 value adjustment): Press the "A4/Flat" key to adjust the reference frequency of the tuner within the range of 430-431,449-450 Hz. 5. Flattened semitone tuning setting: In the guitar (G) or bass (B) tuning mode, long press the "A4/Flat" key for 1.5 seconds to set one to three flattened semitones. Continue to hold down to exit flat Semitone mode. This function can only be set in the guitar or bass tuning project. PackageList:1 xGuitarCapoTuner 1 xButton Battery 1 x Chinese and English User Manual