This opthalmoscope set features a head that offers easier entry into the eye, a larger field of view and reduced glare thanks to the patented Welch Allyn Coaxial Vision System. The halogen lamp insures true tissue color. This opthalmoscope has 18 unique aperture/filter combinations and a Polarizing filter which virtually eliminates corneal reflection. The universal rechargeable handle powers has an adjustable rheostat control. Its free-floating reserve setting allows optimal intensity and battery life. The convenient built-in charger allows you to plug into any conventional wall outlet for overnight recharging. A long-lasting rechargeable nickel-cadmium battery is included. Its smooth, non-abrasive knurled finish ensures a no-slip grip. Its chrome-plated brass handles provide durable, long-life construction. It has a safety switch to prevent accidental draining of the battery and metal head connectors for durability.