2.4 separated lens: provide 10X, 15X, 20X, 25X magnification, all the lenses of this glasses series are interchangeable. 3. and foldable, easy to carry and storage.Made of high-quality plastic and acrylic optical lenses, and wear . Warning: Please do not put magnifier under direct sunlight to avoid fire. Please make sure not to view the sun with magnifier to safety. Please keep magnifier away from banana oil, alcohol and gasoline, etc. Can't wear glasses when using it. 1. Ideal for detailed and small work, such as inspecting jewelry, needlework, PCB check, soldering, reading or any other works requiring a focus on small objects. Note: The lens of 20X and 25X has a groove on side, which is designed for disassembling easily.