German 2.5v lamp for bright illumination. Bayonet locking otoscope head. Removable 3x magnifying lens. Rheostatic on/off switch. Autoclavable, polypropylene ear speculum in sizes 2.5mm, 3.5mm, and 4.5mm. Powered by 2 “C” cell batteries (not included). Comes with zippered leatherette storage pouch that holds the otoscope and included speculum.