A great magnifier especially in areas that you may not have the light you need. The area below the 18mm (11/16 inch) diameter lens is well lit by a white LED (includes the three AG-12 batteries). It has a push-on, push-off switch to operate the light. It swivels into a compact 2 1/2 x 1 1/4 x 3/4 inch metal cover, and can hang on a chain or stay in its included plastic storage case, along with the tiny screwdriver that opens the battery compartment.