Features: 1. Made of alloy, strong and durable. 2. High sensitivity tuner, more accurate, precise, convenient and fast. 3. The tuner automatically detects sound and displays the note name accordingly. 4. When the note name displayed on the screen remains the same as the sound from your instrument, and the accuracy field points to calibration 0 vertically and the LED light turns green. 5. If there is no operation or no signal input for 30 seconds, it automatically switches to power saving mode and the backlight turns off. When there is operation or signal input, the backlight turns on again. 6. Perfect for acoustic guitar and electric guitar. Specifications: Material: Alloy Color: Silver/Brown/Gold/Black/Bronze (Optional) Tuning object: a. Tuning under special key: C (Chromatic) b. String instrument tuning: Guitar (G) Bass (B) Tuning range: A0 (27.5Hz) --- C8 (4186Hz). A4 calibration: 430Hz --- 450Hz Tuning mode: Clip Tuning accuracy: ??0.5cent Power supply: 1 pc 3V CR2032 (not included) Item size: 7.5 * 1 * 11cm / 2.9 * 0.4 * 4.3in Package list: 1 * Capo Tuner Note: Battery is not included. If the LCD screen starts to dim or become unclear, replace the new battery and insert it again within 10 seconds. The guitar shown in the picture is not included.