Our Coaxial Ophthalmoscope uses a Halogen HPX lamp that provides 30% more light output for true tissue color and consistent long-lasting illumination * 28 lenses from -25 to +40 diopters for better resolution * The coaxial optical system produces a shadow-free spot and easier entry into undilated pupils * The crossed-linear polarizing filter reduces corneal reflection * The red-free filter may be used with any aperture * It has 18 possible aperture combinations for greater versatility * Otoscope uses Halogen HPX lamp and fiber optics for cool light with no reflections no obstruction * It comes with a wide-angle viewing lens for instrumentation under magnification * The Lithium-Ion Handle 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 CYCOLOY© 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 * Key Components: 3.5v Coaxial Ophthalmoscope Head with Halogen Lamp (Model 11720) 3.5v MacroView Otoscope Head with Specula and Halogen Lamp (Model 23810) 3.5v Lithium-Ion Handle with Removable AC Adapter (Model 71900) Hard Case for 3.5v Set * Reusable Polypropylene Diagnostic Otoscope Specula Set of Four (2 3 4 5 mm) * The Welch Allyn Warranty: Welch Allyn will repair or replace free of charge any parts of its own manufacture proven to be defective through causes other than misuse neglect damage in shipment or normal wear *