Model Number: EY-XP Brand Name: Hengzi Key Specifications/Special Features: Ophthalmoscope and otoscope EY-XPIllumination form: big spot, small spot, red free, central net,slit, spot, red freeCompensation filter: Polar filter, red-free filter, no filterDiopter compensation: 0 ±1 ±2 ±3 ±4 ±5 ±6 ±8±10 ±15 ±20 ±25 +40 (D)Size of ear speculum: 2.5, 3, 4, 5mmMagnifier: 3 timesPower supply: 1.5V * 2 “C” type battery (#2)Illumination Bulb: 2.5V/0.45A