The Welch Allyn 2.5V Pocket Scope Ophthalmoscope is lightweight and compact and uses halogen light for true tissue color and consistent, long-lasting illumination. Model 12811 comes with a rechargeable handle and Nickel Cadmium battery. It has five aperture selections for general and specialist use. 48 lenses for better resolution. Its polarized filter reduces corneal reflection. Plus, 12 aperture/filter combinations for greater versatility: micro, small, and large spot sizes, cobalt blue filter for corneal exams, fixation target, and slit aperture, plus red-free filter and unfiltered halogen.