Features:1.Made of alloy strong durable.2.Tuner with high sensitivitymore accuratepreciseconvenient rapid.3.The tuner detects sound automatically shows the note name accordingly.4.When the note name shown on the screen stay the same as the sound from your instrument the accuracy bar points to calibrate 0 vertically the LED light turns green.5.If no operation or no signal input for 30 seconds it will turn to power-saving mode automatically 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 electric guitar.Specifications:Material: AlloyColor: Silver/Brown/Gold/Black/Bronze (Optional)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---450HzTuning mode: clipTuning Accuracy: ??0.5centsPower Supply: 1 piece 3V CR2032 (not included)Item Size: 7.5111cm / 2.90.44.3inPackage List: 1 Capo TunerNote:The battery is not included.LCD showing begins weak or unclear please replace new battery insert them again in 10 seconds.The guitar showed in the picture is not included.