Didn't come with any instruction manual. It took me a little while to figure out that you have to tighten by spinning the middle part and not individually on each side. You also need a strong doorway to use this product. After five minutes of use, I noticed that my doorway was actually splitting so I had to stop using it. I ended up giving it to somebody else as a gift but if you have doorway that can handle it, you should be fine.