This is a distortion effect pedal and amp simulator. It has three modes: TWEED, which simulates a Fender combo amp; CALF, which simulates a Mesa Boogie; and BRITISH, which simulates a Marshall. It has a warm, analog sound, and each mode accurately captures the characteristics of the amps, making it easy to use. It can also be used as a regular effect pedal. As you can see in the images, the enclosure shows signs of use. Based on my testing, there appear to be no issues. Since it is an older item, please refrain from purchasing if you are concerned about minor details. Thank you.