Glass Coated Optics (Deutsche Industrie Normen Coated) Single Head view Cordless LED in Base illuminator, including 110 V & battery charger Minimum 50 hour use on single charge Nickel Metal Hybrid battery-based Minimum 10000 hour LED life All metal construction Minimum 10X wide field eye piece with point 4X, 10X, 40X par focal, achromatic objective Retractable 40X objective Coarse and fine focus Built-in mechanical stage with slip clutch and stop Stage size is 110mm x 120mm Condenser Disc diaphragm Illumination is plano concave reflector Net weight is approx.3kg Dimensions are 140mm(L) x 190mm(W) x 350mm(H)