1R13 high and low octave monoblock effect is functional and practical, simple and clear 2Support independent high octave adjustment and low octave adjustment, you can freely set your favorite tone 3Equipped with the MOD modulation effect, which has richer sound than similar products 4Working voltage is DC9V, easy to use, helpful for performances and concerts, also a great gift for guitar lovers 5Good quality metal materials have high hardness, high strength, and good metallic luster, beautiful and practical Item Type: Octave Effect Pedal Material: Metal Color: Purple Input Impedance: 2.2M Output Impedance: 100 Working Current: 90mA Working Voltage: DC 9V (external for positive and internal for negative) (adapter not include) 1 x Effector 1 x User Manual 4 x Pad Note that the positive and negative poles of the power supply must be the same as the positive and negative poles of the effector.