SINGING AUTOWAH envelope filter, with adjustable sensitivity and sustain. - Model Name: SINGING AUTOWAH - Type: Envelope Filter - Color: Green - Power: DC 9V - Controls: Sensitivity, Sustain, Depth Thank you for viewing. This is a guitar effects pedal that was at my parents' house. I have confirmed that it produces sound. There are some scratches from use. I do not know much about the sound or how it feels to use. My family cherished this item, so I would like to pass it on to someone who will continue to use it. #MintAmp I am also selling other effects pedals! I will pack it carefully and ship it! ✨