AROMA AMX-3 MATCHBOX D.I. Transfer Guitar or Bass Signal to Audio System Analogue Effect Pedal with 1/4" Plug Zinc Alloy Connector Cabinet simulator switch: Switch the 4 * 12" cabinet simulator on and off. Gain: Switch the gain between -20dB, 0dB and +20dB. GND switch: It can eliminate hum or ground loops depending on the grounding of the connected equipment. On/off LED: Indicate effects or bybass status of matchbox.Input jack: 1/4" mono audio jack for connecting guitar. Unbalanced output jack: 1/4" mono audio jack for unbalanced signal output.Balanced output jack: XLR audio jack for balanced signal output.Come with a Connector.