"Battery handle features bayonet for quickly changing included instrumentheads. Rheostat controls light intensity in instrument heads. Kit comes with: chrome-plated, bent-arm illuminator for lighting oral cavity and pharyngeal area, two chrome-plated laryngeal mirrors, sized 3mm and 4mm, that attach to illuminator, mirrors, sized 3mm and 4mm, that attach to illuminator, may ophthalmoscope with lens wheel and correcting lens diopters from -20 to +20, chrome-plated nasal speculum that manually opens and closes within a wide range, chrome-plated otoscope with removable cap, three reusable specula, swivel magnifying lens with outlet for pneumatic testing, chrome-plated tongue blade holder that uses wood or plastic tongue blades, traditional hard storage case. Battery handle operates on two C batteries, not included. "