This portable set features Welch Allyn's finest diagnostic instruments. The Welch Allyn 3.5v Standard Ophthalmoscope (11710) is both versatile and economical. It features halogen light for true tissue color and consistent, long-lasting illumination and 28 focusing lenses. The MacroView Otoscope (23820) uses Halogen HPX lamp and fiber optics for cool light with no reflections, no obstruction. It comes with a built-in throat illuminator/penlight and a wide-angle viewing lens for instrumentation under magnification. The Welch Allyn Lithium-Ion (Smart) Handle (71900) is just half the weight of current 3.5v handles. It averages 120 minutes of on time between charging. It has the smallest diameter of any 3.5v power handle on the market. The textured handle is made of sturdy resin. It comes with a low-battery indicator and lithium-ion battery technology that has no "memory" effect. It has a soft-grip rheostat intensity control, and AC charging module with retractable prongs that is easily removable from the handle.