Illuminated Sliding Pocket Magnifier with LED Light. 10X - 20mm (3/4 in.) Illuminated Sliding Pocket Magnifier with LED Light, Doublet Glass Lens, Requires 3AG10 (LR1130) Batteries (Batteries Are Included.)To use the magnifer and LED light, hold on to the grips at the sides of the body and pull out the magnifer. When the magnifier is fully extended the LED light will turn on. Push the magnifier back into the body to turn off the LED light and store the magnifier.