I purchased this on Mercari about a year and a half ago. It works without any problems. Below is the creator's description: This is a self-made EarthQuaker Devices Life Pedal-style octave/distortion pedal. I made it based on a reference circuit found online. The left footswitch is a RAT + octave circuit, and you can switch between three types of distortion with the switch. The right footswitch is an independent clean booster. I have confirmed that it works and that the sound changes, but I have not verified the difference in sound compared to the original, so I cannot guarantee it. Batteries cannot be built-in. The label is an original design using free materials. Please understand this before purchasing.