Made of alloy, strong and durable. TCapo20 is not only a professional capo but also a professional tuner. Tuner with high sensitivity,more accurate,precise,convenient and rapid. The tuner detects sound automatically, and shows the note name accordingly. When the note name shown on the screen stay the same as the sound from your instrument, and the accuracy points to calibration "0" vertically, and the LED light turns green. 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. Perfect for acoustic guitar and electric guitar. Specifications: Material: Alloy 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 Tuning Accuracy: andplusmn;0.5cents Power Supply: 1 piece 3V CR2032 Package Included: 1 x Capo Tuner Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store