This product is available because I wanted to see if it is a product I'd like to carry and since I can't see myself using the one I opened, I thought I'd pass the savings on to you! There are three interchangeable lenses that give 1.6, 2, and 2.25 magnification strengths. It's nice because even though you'll look a little dorky, you have magnification at the ready when you need it. It's also great for glasses wearers because you can keep your glasses on!