Thank you for viewing. I am selling this item to organize my equipment. I have used this item for about two years at home, in the studio, and at live performances, so there are fine scratches and dirt. The label on the back is missing, but it is fully functional and can still be used. Guitar effect pedal that effectively removes noise, with adjustable THRESHOLD. - Model Name: NOISE KILLER - Input Terminals: INPUT - Output Terminals: OUTPUT - Switch Type: Hard/Soft Switch - Threshold Adjustment: THRESHOLD knob Thank you for looking.