Precise lamp filament and optical alignment 3.5V Halogen lamp provides light output for true tissue color & consistent, long-lasting illumination 28 Diopter lenses ranging in power from -25D to +40D 18 unique aperture/filter combinations for greater versatility Bulb: 3.5V 2.7W Operation mode: Intermittent, On-time should not exceed 2mins, with off-time not less than 5mins Handle Lithium ion battery technology that has no “memory” effect 120 minutes of on-time(compared to 60 minutes for standard NiCad handles) Made of sturdy CYCOLOY engineering resin USB charger is for optional* Includes

1 Ophthalmoscope head, 1 Handle & 1 Desk-top charger

It provides optimum light levels for all eyes, including those with cataracts.