This set includes the Welch Allyn 3.5v Operating Otoscope Head with Specula (21700) and a rechargeable handle (71000-A). The otoscope has an open system, rotatable lens and speculum for convenient procedures. It uses a Halogen HPX lamp that provides 30% more light output for true tissue color and consistent, long-lasting illumination. Its open system is convenient during procedures. The rotatable lens and speculum allows ease of use and its fiber optic illumination produces cool light. The universal rechargeable handle is well-balanced and rests comfortably in the hand. Its weight is evenly distributed end to end. It 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. Metal head connectors for durability.