Features: Made of alloy strong and durable. TCapo20 is not only a professional but also a professional tuner. Tuner with high sensitivity more accurate precise convenient and . tuner detects sound automatically and shows note name accordingly. When note name shown on screen stay same as sound from your instrument and accuracy bar points to calibration 0 vertically and LED light turns green. If no operation or no signal input for 30 seconds it will turn to -saving mode automatically and back light will be off. When there is operation or signal input back light will be on again. Perfect for acoustic guitar and electric guitar. Specifications: Material: Alloy Color: Coffee and Silver (Optional) Tuning item: a.Tuning under spcial key: C(Chromatic) b.String instrument tuning: Guitar(G) Bass(B) Tuning : A0(27.5Hz)---C8(4186Hz). A4 calibration: 430Hz---450Hz Tuning mode: clip Tuning Accuracy: ±0.5cents Supply: 1 piece 3V CR2032 (not included) Item Size: 7.5 * 1 * 11cm / 2.9 * 0.4 * 4.3in Item Weight: 77g /2.7oz Package Size: 10 * 2 * 10cm / 3.9 * 0.8 * 3.9in Package Weight: 94g / 3.3oz Package List: 1 * Tuner Note: battery is not inclueded. LCD showing begins weak or unclear please replace new battery and insert them again in 10 seconds.