This Ophthalmoscope uses halogen light for true tissue color and consistent, long-lasting illumination. • Illumination: 3.5V 2.8W mini halogen bulb • Recharging unit: 110V/60Hz 8VA • 5 apertures for generalist use: small, and large spot sizes, fixation target, slit aperture, and red-free filter. • 25 focusing lenses with a range of -35 to +20 diopters. • Rubber brow rest prevents scratching of eyeglasses. • Dimension: 42x32x210mm