Okay, I'm not going to lie; I just copied and pasted this from another website:

"The Guyatone PS-016 Distortion Limited was one of the range of unique drive pedals released by Guyatone in the 80's. The PS-016 offers a compressed distortion tone that could be compared to the Japanese Boss DS-1's with an increased bass range and tighter sound."

So there you go!

I tested all functionality including power input, all knobs, all jacks, and the footswitch. All work just fine. I'll test the item once more before I ship the item. Please be mindful that you are purchasing a vintage pedal and the foot switch might not work every time if you press it 1,000 times. If you unsatisfied, please contact me before leaving a review. Maybe we can work something out. I want you to be happy but I am not Amazon and my name isn't Jeff Bezos.