The ADC 2.5v diagnostic set features: Ophthalmoscope head with lens wheel features 25 corrective lenses from -20 to +20 diopters; Otoscope head with removable 4x magnifying lens, and insufflator fitting; Bayonet head locking mounts for secure connection to the battery handle; "C" cell powered battery handle with rheostatic on/off switch; Auto-clavable, polypropylene ear specula in 2.5mm, 3.5mm, and 4.5mm sizes; Adapter to allow use with Welch Allyn or compatible disposable specula. Complete in zippered case with fitted foam insert that is scuff and scratch resistant and cleans easily. Weighs 20 oz. Inspected and packaged in the U.S.A. from foreign components. Batteries NOT included.