The unit works fine on battery power, but it doesn't work when plugged into a power supply. It seems like a part replacement might be necessary, but it works perfectly fine when using batteries. Distortion effector ADT-1, adjustable LEVEL, TONE, and DIST. - Model Name: ADT-1 - Brand: ARIA - Function: Distortion - Controls: LEVEL, TONE, DIST - Terminals: IN, OUT Thank you for looking.