This is an MXR noise reduction/noise gate. It does not power on. It didn't power on with either a battery or a power supply. I bought it as a junk item at a shop and replaced the electrolytic capacitors with SMD ones of the same capacitance, but it didn't work. I'm a novice, so I gave up because I couldn't do anything more. I haven't touched anything other than the electrolytic capacitors. I will also include the original electrolytic capacitors. It has some scratches, but overall it's in good condition, so I hope someone can use it for modification or parts.