The 18310c set includes an ophthalmoscope, retinoscope, rechargeable handle and hard case. The Welch Allyn 3.5v Standard Ophthalmoscope (11710) features halogen light for true tissue color and consistent, long-lasting illumination and 28 focusing lenses. The Streak Retinoscope (18200) enables easier and quicker refractions with a crossed linear polarizing filter that eliminates bothersome glare from trial lenses. Sealed optics keep the lenses cleaner. The 71000C universal rechargeable handle accepts all Welch Allyn 3.5v instrument heads. Its chrome-plated brass handle rests comfortably in the hand. It comes with an adjustable rheostat control; smooth, knurled finish; and safety switch to prevent accidental battery drainage. It can be recharged by plugging directly into a wall outlet. The 71000C model also includes a battery converter accessory that allows the handle be powered by C-cell batteries, a handy feature if you're on call or have forgotten to charge the battery.