Description Features: Made of alloy, strong and durable. The TCapo20 is not only a professional capo but also a professional tuner. High sensitivity tuner, more accurate, precise, convenient and fast. The tuner detects sound automatically and displays the note name accordingly. When the note name displayed on the screen is the same as the sound from your instrument, and the accuracy bar points to calibration 34 0 34 vertically, and the LED lights up green. If there is no operation or no signal input for 30 seconds, it will switch to energy-saving mode automatically, and the backlight will be off. When there is operation or signal input, the backlight will turn on again. Perfect for acoustic guitar and electric guitar. Specifications: Material: Alloy Color: Coffee and Silver (Optional) Tuning item: 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: 0.5 cent Power source: 1 piece 3V CR2032 (not included) Item size: 7.5 x 1 x 11cm or 2.9 x 0.4 x 4.3in Item weight: 77g or 2.7oz Package size: 10 x 2 x 10cm or 3.9 x 0.8 x 3.9in Package weight: 94g or 3.3oz Package list: 1 x Capo Tuner Note: Battery is not included. If the LCD display starts weak or unclear, replace the battery and insert them again within 10 seconds.