Features: Full metal shell, exquisite and big sound. Single knob control to adjust the degree of booster. volume =0: clean buffer. volume Greater than 0: clean boost. Offering excellent, stable buffering and a fantastic clean boost. The light flashing when working. True bypass switching in order to protect signal integrity when the pedal is not engaged. Foot-switch toggle controlling on/off condition. Specifications: Model: Dec Input Impedance: 1M ohm Output Impedance: 1K ohm Working Current: 20mA Power Supply: 9V DC Charger (Not included) Item Size: 9.2 x 3.8 x 3.6cm / 3.6 x 1.5 x 1.4in Color: Green Material: Metal Package Contents: 1 x Guitar Effect Pedal Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.