Digitech Whammy 4. It powers on and effects work, but there is a popping noise, so it is a junk item. The noise decreases if left on for a few minutes. I can't determine if the power adapter is bad or the unit itself is faulty, so it's for those who can repair it, use it for parts, or use it as a noise effect. Since it is a used item, there are scratches and paint剥がれ (peeling) so please check the photos. Due to it being a junk item, returns due to operational defects are not accepted.