Product Title:Acoustic Guitar Tuner Capo Quick Change Key 2 in 1 Capo Tuner Metal for Electric Guitar Bass Chromatic Parts Accessories. Features: 1.Made of alloy strong and durable. 2.Tuner with high sensitivitymore accuratepreciseconvenient and rapid. 3.The tuner detects sound automatically and shows the note name accordingly. 4.When the note name shown on the screen stay the same as the sound from your instrument and the accuracy bar points to calibrate 0 vertically and the LED light turns green. 5.If no operation or no signal input for 30 seconds it will turn to power-saving mode automatically and the back light will be off. When there is operation or signal input the back light will be on again. 6.Perfect for acoustic guitar and electric guitar. Specifications: Material: Alloy Color: Silver Tuning item: a.Tuning under spcial 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 Power Supply: 1 piece 3V CR2032 (not included) Item Size: 7.5111cm / 2.90.44.3in Package List: 1 * Capo Tuner Note: The battery is not included. LCD showing begins weak or unclear please replace new battery and insert them again in 10 seconds. The guitar showed in the picture is not included. Due to different measurement methods, please allow a measurement error of 2-3cm. Due to the problem of shooting tools and light, please allow the color difference between the picture and the product.