This version of the Welch Allyn 3.5v Standard Ophthalmoscope comes with a rechargeable handle and hard case. The 11710 ophthalmoscope features halogen light for true tissue color and consistent, long-lasting illumination and 28 focusing lenses with a range of -25 to +40 diopters. It has six apertures for generalist use: micro, small, and large spot sizes, fixation target, slit aperture, and red-free filter. 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.