14mm aperture provides broader and clearer field of view. Joystick is made by metal, and the overall appearance is fantastic, and at the same time it increases clinical operation space. Five-step drum magnification, Five-step drum magnification of eyepiece. Sclera vein could be ocserved under the 40X magnification. All the joints can be connected by accessories with with international standards. By stepless adjustable photoelectric box, it can provide all kinds of appropriate brightness of the lightening according to the clinical doctors' actual demand.