Carson Optical LED Attach-A-Mag Clip on Tabletop 2X Magnifier (AM-20) 2x Power Rim Free Adjustable Hobby Magnifier with a Clamp-On Base | Lens Diameter: 4.0 inches LED Lighted with 2 Super Bright LED Bulbs | Magnifying Glass Has a Scratch Resistant Acrylic Lens Flexible arm allows you to position the lens where you need it most | Powered by 3 G12 Button Cell Batteries (included) Perfect work bench or desk low vision aide for reading fine print,model building, small electronics, soldering, hobbies, crafts, arts, fly tying and tasks. Backed by Carson's Limited Lifetime Warranty