Direct plug-in style. Universal handle accepts all Welch Allyn 3.5 V instrument heads. Well-balanced handle rests comfortably in
the hand; weight is evenly distributed end to end. Adjustable rheostat control – free-floating reserve setting allows optimal
intensity and battery life. Economical – long-lasting rechargeable nickel-cadmium battery included. Sure grip – smooth, nonabrasive
knurled finish ensures a no-slip grip. Chrome-plated brass handles with durable, long-life construction. Safety switch to prevent
accidental draining of battery. Metal head connectors for durability. 100-130 V, 50/60 Hz.