Field Angle 45°±5° Adjustable Interpupillary Distance 52mm-74mm Adjustable Range of Head Bracket Head Circumference:530mm-630mm，Depth: 85mm-125mm Illuminance ≥500lx Illumination Source 6V/10W，Halogen Bulb Power Supply AC220V/ 50Hz、AC110V / 60Hz Dimension of Main Body（mm） 142×48×128（L×W×H） Weight of Main Body 230g