I'm selling this because it was found in an old effects pedal case. Operation has been confirmed with a 9V power supply. Please note that this item is sold as-is (no claims, no returns) as I am unable to compare it to a new unit regarding any crackling or noise. The Line 6 Uber Metal effects pedal, capable of creating a wide variety of sounds. - Model Name: Uber Metal - Brand Name: Line 6 - Type: Guitar Effects Pedal - Number of Control Knobs: 4 - Input/Output Terminals: OUT terminal present Thank you for looking.