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: 4.25 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.