The LED Lighted Attach-A-Mag (AM-20) from Carson is a fully adjustable, rimless magnifier that has a built-in clamp-on base so you can easily attach it to work benches, desks and so much more! The Attach-A-Mag contains an oversized, scratch resistant acrylic lens magnifying glass (Lens Diameter: 4.0 inches) with a 2x power magnification. The flexible, adjustable arm allows you to position the lens where you need it most. The Attach-A-Mag contains 2 super bright LED lights that are powered by three G12 button cell batteries (included). The Attach-A-Mag is a great low vision aide. Use this hobby magnifier for reading fine print in books, magazines, coupons, model building, soldering, crafts, fly tying, small electronics and for other tasks. The Attach-A-Mag is backed by Carson"s limited lifetime warranty. At Carson, we strive to make sure our customers are 100% satisfied with the quality of our magnifiers. We are so confident in our magnifiers that we back them with a Lifetime Limited Warranty! Carson will repair or replace your magnifier if it is found to have manufacturing defects in materials or workmanship. Please contact Carson for additional warranty details.