Model Number: JYAXP Brand Name: Hengzi/Shenguang Key Specifications/Special Features: Illumination form: large, small spot, red Ferrari, central net,slit, spot and red-freeCompensation filter: polarizing, red-free and noDiopter compensation: 0, ±1, ±2, ±3,±4, ±5, ±6, ±8, ±10, ±12,±15, ±20, -25 and +40 (D)Power supply: 1.5V x 2C typeIllumination bulb: 2.5V/0.45A