Ernie Ball Wah pedal, 9V DC power supply compatible, with AC adapter. - Brand: Ernie Ball - Model: Wah Pedal 6185 - Input terminals: IN - Output terminals: OUT - Power: 9V DC IN - Included accessories: AC adapter Thank you for viewing. This is a discontinued wah pedal, no longer in production. I don't have a guitar on hand, so I haven't been able to confirm its operation. Please refrain from purchasing if you are concerned about this. However, it was working without any problems the last time I used it.