MXR Dyna Comp. Purchased as a used item. Since the DC jack is center-positive, which is not the current standard, it appears to be a model from over 20 years ago. I don't have a center-positive jack, so I've confirmed its operation with a battery. The Sensivity knob has a slight scratchiness just before the end of its range, but I don't think it will be a problem during performance. No accessories included. Thank you. Type...Electric Guitar Manufacturer...MXR Compressor compressor