Welch Allyn PanOptic Diagnostic Set : 3.5V PanOptic Ophthalmoscope with Axial PointSource Optics offers a 5X larger field of view and 25% more magnification vs. traditional ophthalmoscopes. Patented Glare Extinguishment System enables glare-free views of the retina. Built in throat illuminator. Features fiber optics and a wide angle viewing lens for instrumentation under magnification. Lithium Ion handle provides twice the on-time with just half the weight of conventional handles for comfortable use. Low battery indicator. Handle accepts all Welch Allyn 3.5V heads.