Provides 30% more light output* 28 lenses from -25 to +40 diopters *18 possible aperture combinations *Uses Halogen HPX lamp and fiber optics  * Averages 120 minutes of on-time between charging * The smallest diameter of any 3.5v power handle on the market *AC charging module with retractable prongs * 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) *