AROMA ADR-3 Dumbler Amp Simulator Mini Single Electric Guitar Effect Pedal with True Bypass. Full metal shell, durable and exquisite. 4 controlling knobs are accurate and high sensitive. Volume knob: Adjust the output volume. Voice knob: Adjust the color of overdrive. Tone knob: Adjust the brightness. Gain knob: Adjust the gain. Output jack: 1/4" mono audio jack for signal output. Input jack: 1/4" mono audio jack for connecting guitar. True bypass footswitch and lever designed to prevent stamping on operation knobs. Buy this and Get 28% OFF AROMA ADR-3 Guitar Effect Pedal.